The singing and the sea

Bute with shiny landscape tidiedWhen you put your boat in at Cowan Creek, you know you’re paddling in the sea.  Yes, there are rocky slopes on every side, and eucalypts and banksias lean over the shoreline.  The rows of hot pink bells of epacris longifolia dangle amazingly close to the waves.

But look over the side of your boat, especially in this big dry, and your gaze falls metres deep into into the crystal clear green water.  It might be called a “creek” but there’s no murky river water here.  Further downstream, where Cowan Creek meets the Hawkesbury proper at Broken Bay, the Pacific meets the horizon and you really know you are in the ocean.

Fishing boat and west head little boy

Fishermen off Flint and Steel Point

Cormorant with fish

Cormorant off Juno Point having a snack

But far above the official mouth of the river – the limit of “flat water sailing” drawn between Juno Head and Flint and Steel Bay – the water is briny.  The tide rolls up the Hawkesbury as far as the Grose River Valley, 138 kilometres from the sea, taking a wedge of salty water upstream.  If Broken Bay, where these pictures were taken, is essentially a marine environment, Cowan Creek is not too much different.

Pixellated yachts

Yachts off Cottage Point

Because of course, the Hawkesbury is a drowned river valley.   The river channel that once wound its way twenty five kilometres to the east, across the continent shelf, has long ago disappeared two hundred metres or more beneath the ocean.  The late Quaternary Marine Transgression that drowned the Hawkesbury started 18,000 years ago and went on for 10,000 years, with the water level peaking just a metre or two above current sea levels.

Paul Boon, in his fascinating history of the Hawkesbury, reports that during that time, sea level rose at perhaps 8-10 metres every millennium, at some times as 40 metres in a thousand years (Boon, 2017, Chapter 3). It‘s hard to imagine what that must have been like for the first people here, the Guringai and Dharug people, moving again and again ahead of the rising tide, away from the coastal flat lands to the hills of the Hornsby plateau.

Side illuminated trees for crop

On the way to Stingray Bay

Even more mindboggling to think, as Boon quietly points out, that over the last few decades sea level has been creeping up by around three millimetres a year. If the CSIRO scientists are right, and I for one don’t doubt they are, sea levels are changing as worryingly fast, if not as fast as the speediest rises in the Flandrian Transgression. On the bright side if I live long enough, there’ll be far more of the upper reaches of Cowan Creek to explore, in an admittedly sweaty and decrepit manner, in my kayak

Pink cloud and cowan creek

Sunrise sky near Cotton Tree Bay

Last weekend’s paddle reminded me of what a special place the Hawkesbury is, a drowned river valley where, after rain, waterfalls tumble off the sandstone straight into the sea.  I was coming back from a jaunt to Smith’s Creek when, heading into a bay to avoid a plague of water skiiers, I heard a lyrebird going for broke.

According to Birdlife Australia, superb lyrebirds are inhabitants of moist forests. I’m sure the one I heard scratching around in the undergrowth by the shore, would soon be heading back to the gullies and the treetops.  But in its distant melange of calls – of satin bowerbirds, kookaburras, currawongs, red wattlebirds and other things I just can’t recognise – was a sound I’d never heard a lyrebird make before.  I’m sure I heard an impression of that paradigmatic bird of the beach – the silver gull.

And that’s the soundtrack of the Hawkesbury estuary, right there,

 

What are your bird call spotting skills like, dear reader?  Can you recognise any other shore birds in this estuarine lyrebird’s song?  If you can spot any extra calls, please let me know!

Other stories from Cowan Creek and thereabouts

A glimpse of a peregrine falcon hunting: death and good fortune in Cowan Creek

Old hands: how Smith’s Creek was nearly Canberra

Stingray Bay – lost and found

The Hawkesbury in winter: the shortest days and how to use them

Broken Bay at low ebb: the troubled history of Hawkesbury oysters

Around the point 2

A winter morning in Cowan Creek

The trouble with the younger generation

It’s not often that the stars are in alignment for a midweek paddle but occasionally it happens.  Children elsewhere, being forced to make music for 48 straight hours; the car (or “kayak transportation device” as I prefer to call it) sitting there unused and no pressing work engagements before 9 am on a Wednesday morning.

Berowra Creek was delightfully quiet, save for a handful of tinnies bearing estuarine commuters towards the wharf and the road to the big smoke roundabout 7 o’clock.  I guess that’s rush hour on the Hawkesbury.

Ferry lights closer crop

Pre-dawn rush at the Berowra Creek ferry

A peaceful river, low tide… time for the shy critters to come out of the mangroves and feast in the mud.

Juvenile Striated heron hunting silhouette with catch brightened

Juvenile striated heron with a tiny fish

I go past the mouth of Joe Crafts Bay quite regularly.  It’s a magical place, blessed with reflections and rolling fog, and a secret creek filled with darting fish.

Towards Joe Craft bay

Looking to Joe Crafts Bay on a misty day

I’m always expecting to see something exotic there, like the critically endangered Eastern Curlew, visiting Australian coast during the northern winter after an epic migration from Russia and western China.   Mostly I see bird-shaped sticks.  But on this quiet morning, what I initially suspected to be a stick turned out not one, but two striated herons.

Juvenile striated heron profile in water 2 amended darkened

Juvenile striated heron pretending no one is looking

It’s pretty unusual to get a good look at these birds, described on one twitcher website, unnecessarily cruelly I think, as “a dumpy little heron with a large head“. Or if you were really mean you might describe it as a dumpy little heron with a jack-in-the-box neck.

Juvenile striated heron alarmed lightened 2 amended square

Juvenile striated heron with neck stretch

I normally spot striated herons only after I’ve already bugged them enough to burst out of their hiding places in the mangroves and fly off, disgruntled, down the river.

Striated heron stretching

Adult striated heron perching at high tide

They are not given to making a lot of noise and hunt stealthily, perched on a low branch over shallow water or creeping along the shoreline looking for little fish, crabs or crustaceans.  Interestingly, they sometimes also fish with bait – dropping a feather or leaf on the water to lure fish to the surface to investigate.  These birds seem to be quite smart  – researchers have even recorded youngsters playing with bugs, fruit and pieces of wood – perhaps practicing for bait fishing.

But for all their creativity, young herons like most juvenile birds, seem to be a little bit slow on the uptake when they unexpectedly encounter a mammal in a boat.  And long may that stupidity continue.

Juvenile striated heron from behind square and lightened

Pensive looking juvenile striated heron

There was also an adult bird on this particular mudflat, clever enough to stay a lot further away.

adult striated profile crop

Adult striated heron, macroryncha subspecies

And while the adult wasn’t incredibly impressed with me being in its territory, it was really very pissed off that it was having to share its patch of low tide real estate with a young heron.  According to the International Union for Conservation of Nature’s Heron Conservation group – an impressively specialised body – African striated herons are so determined to defend their territory that you only find a couple of individuals in a 13 kilometre stretch of river.  Our aggro Aussie adult, true to form, went after the youngster no less than three times while I was watching, chasing it off the prime spots on the mudflat with real venom.

Adult straited chasing juvenile crop long

Adult striated heron chasing off a juvenile off his feeding grounds

Not so the adult could hunt.  Oh no. Youngster was finding fine pickings.  But having cleared him out, the adult heron did this:

Nada.  Played a game of statues. Or maybe pretended to be a stick for the benefit of nosy kayakers. It’s always pleasing to see birds behaving as expected.  Here we see an “adult… freez[ing] when disturbed; standing motionless with their bill… at 45 degrees

I was surprised to find that the striated heron, shy and retiring as it is, has been described as “one of the more cosmopolitan herons“, which suggests somehow it has well-used hand luggage tucked away in the mangroves somewhere and frequent flyer points.  Sub-species (in an attractive range of colours) are found right around the world – from Africa, Madagascar, the islands of the Indian Ocean, East Asia, and South America.

Adult Striated heron walking toe out good pattern

Adult striated heron stepping out

Australian striated herons – both the east coast macroryncha, grey with perhaps a flush of wine colour on its underparts, and the reddish-brown stagnatilis which living in the north west – are a bit fussier than many overseas subspecies, living pretty much exclusively in coastal areas in and around mangroves. That’s quite different to the rarer but to my untutored eye somewhat similar looking black bittern that is found along forested rivers, like the Wyong River where I spotted this one, and even rivers much further inland.

If you’re kind of fussy about where you live, Joe Crafts Bay seems a tremendous place to end up.  No wonder the grumpy grownup wants to keep it to himself.

Magic Joe Craft Bay

Joe Crafts Bay at its magical best

 

More adventures on the Hawkesbury

A visit with the eagles of Mooney Mooney Creek

Magic scenes on a cold and foggy day on Cowan Water

The silver river – up Marramarra Creek

Of gods and map readers – into Muogamarra National Park

Two sad islands, three whistling kites – a visit to Barr Island

Burnoff at Bujwa Bay

Alhambra on the Hawkesbury

 

 

 

The one-eyed butcherbird

Butcherbird in tree good eye gleaming 2

We had an unusual visitor this weekend – a cocky grey butcherbird, turning up first in the branches of the Japanese maple that reaches up to our back deck, and then hopping boldly onto the balustrade.

BB profile horizon corrected cropped

Our butcherbird showing off his hooked beak

Butcherbirds are just the kind of generalists – like fellow “corvoids”, magpies and currawongs – that do really well in urban areas.  But we’re rarely had them turn up at our place before.

And this lovely lad (or lass – they look too similar for an amateur like me to distinguish) was notable in another way, too – it had only one fully functioning eye.

Looking side on you could see a glimmer of a right eyeball, but it was sunk back into the feathers of the head – on a front view only his inquiring left eye was visible.

Butcherbird on ground looking at me frontallycrop

Our one-eyed butcherbird

The wounded eye seemed to have healed long ago – this guy was distinctly perky and healthy looking, if a little edgy.  And this was an adult bird – no sign of the brown and buff colours of a juvenile (like this one spotted at Narrabeen Lake a few years ago).  So whether it had been injured as a chick or as an adult, it seems to have been getting along okay for quite some time.

Juvenile grey butcherbird crop long

Juvenile grey butcherbird

In the past, animal rescue organisations assumed that birds with serious injuries to an eye wouldn’t make it if they were released from captivity.  Usually birds found wounded in this way were euthanised.  But in Germany and the US, researchers and birdwatchers have reported hunting birds like owls and eagles surviving for years in the wild – and even successfully breeding and raising chicks – with only one functional eye.

On a first glance, it seems obvious that binocular vision would be important for judging distances when flying.  An early twentieth century ornithologist proposed that “a bird is a wing guided by an eye” but it seems there’s a lot more to eyesight in birds than navigating through the air.

Researchers think that binocular vision is more about being able to see what you’re doing with your beak than getting around on the wing. Birds that have to do tricky things with their bills – cormorants making sure the fins of the fish they’ve just caught are in the right position to slide nicely down their throats, for instance – need to see what they’re doing.  Having your eyes at the front of your head means you’re less likely to spot a predator from behind, but it’s worth it for the tucker.

It was interesting to watch our visitor managing life with a limited visual field.  He could certainly fly, and RB saw him successfully catch something that was scuttling around on the deck.  That said, when we (naughtily) fed him a few pieces of meat, he seemed to struggle a little to get a handle on it.

He was also pretty twitchy, reacting to every sound, looking regularly over his shoulder so he could keep tabs on his surroundings with his good left eye.  Butcherbirds usually dive down on prey from above, and as he looked out for tasty treats below, he kept his head cocked to maximise his vision.  As a someone with only one “good” ear, I recognise the advantages of that head tilt!

Butcherbird facial closeup good

Our one-eyed bird keeping an tabs on surroundings with his one good eye

Our visitor also seemed to understand the possibilities of humans as a resource.  At one point he flew right up to where I was sitting by the balustrade, looked me in the face and “spoke” to me in a mildly demanding way familiar to me from my teenaged childen.  Later on, I went inside, leaving the sliding door was open, just a bit. The butcherbird hopped up to the door,  and after a few moments of hesitation, continued straight through into the house.

Butcherbirds are smart and excellent problem solvers.  They’re also creative, as my colleague, the violinist and composer Hollis Taylor found, when she started analysing their marvellous improvisational music making.  Was our butcherbird visitor just curious, and yearning to see our interior decor?  No matter how clever these guys are, that seems unlikely.

Butcherbird on chair looking at me blind eye visible crop tighter.jpg

I suspect that this guy was looking for friends.  Perhaps some local folks who regularly fed him – maybe in a room with a sliding door, just off a deck?  Did his human buddies take care of him after his eye was injured?  I don’t know but I can say for sure he expected good things from us, and our kind.

BB inside head cocked cropped

Grey butcherbird expecting good things from humans

References

Brown, Matthews (2016) Clever crows: Investigating behaviour and learning in wild
Torresian crows (Corvus orru) and related Cracticids in a suburban environment, Doctoral thesis, Griffith University.

Hegemann, A, Hegemann, ED, Krone, O. (2007) “Successful rehabilitation and release with subsequently brood of a one-eyed Eagle Owl (Bubo bubo)” Berliner und Münchener tierärztliche Wochenschrift 120(5-6):1

Martin, Graham (2017) “What drives bird vision? Bill control and predator detection overshadow flight” Frontiers in Neuroscience 11

Tyrrell,Luke and Fernandez-Jericic, Esteban (2017) “Avian binocular vision: It’s not just about what birds can see, its also about what they can’t” PLOS One, Mar 29.

The sacred comes to the neighbourhood

kingfisher in pine tree 2 long bright

I was just nipping back from depositing a small part of our egg mountain with our friends across the road last week, when something odd flew across the drive – something I’d never seen at our place before.  It turned out to be this guy – a sacred kingfisher.

I don’t know why I was so surprised to see a kingfisher here, a kilometre or more and a couple of hundred metres up the hill from the creek.  Possibly because I do regularly see these lovely birds on my paddles in the Hawkesbury – hunting in the mangroves lining Milson’s Point; regurgitating pellets in full view of the expensive holiday homes in Calabash Bay or this young ‘un, hanging out near the public wharf at the questionably named Dusty Hole.

Juvenile kingfisher head cocked

Juvenile sacred kingfisher by Berowra Creek

Though I have repeatedly spotted them in bushland far from decent stretches of water, I managed to convince myself that they were fishing in the local tiny, slightly fetid pools.  But of course, ten minutes of googling gave me the correct answer.  Unlike the smaller azure kingfishers – the sacred mostly eat terrestrial prey – insects, skinks and even sometimes small birds. They rarely actually eat fish: there should be some kind of by-law, right?

Azure kingfisher amended crop

Azure kingfisher chilling out in the winter fog

Our visitor hung out for quite a while in the neighbours’ backyard, giving me the chance to race off for my camera and get into a possibly compromising position with my zoom lens propped up on the fence, pointing in the general direction of their living room windows.  The kingfisher was certainly aware a stalker was watching him from the bushes but didn’t seem too fazed.

Kingfisher looking at me close 2 crop square amended

“What are you looking at? Stalker!”

After my efforts to create bird habitat over the last few years, I felt a bit jealous that this gorgeous creature was choosing to hang out in our neighbour’s back garden.  However, I have to reconcile myself that their densely-planted native garden has the low shrubs these birds like to perch on while they’re waiting to dive down onto their prey in the leaf litter, without the loud woodwork projects, inquisitive chickens, trampoline and horde of neighbourhood kids that ramp up the action in ours.

Kingfisher wings out long amended

A wing stretch from our visiting sacred kingfisher

Sacred kingfishers are surprisingly mobile it seems.  They are the only kingfisher in these parts that is migratory.  Many (though not all) of the birds that live in the southern parts of Australia migrate each each to north Queensland and PNG – it’s a partial migrant like most other Australian migratory birds. I suspect that the local sacred kingfishers – or at least some of them – hang around in the winter.  Peter and Judy Smith (2012), keeping tabs on the arrival dates of migratory birds in Blaxland in the lower Blue Mountains, for over 30 years never saw a sacred kingfisher in the winter, but I’ve seen a couple on the Hawkesbury in the colder months – hanging out in America Bay in April and basking in the late afternoon light by Berowra Creek in July, right in the middle of winter.  Or “winter” as my British friends like to call it.

When I visited Wellington a couple of years ago I was surprised to see something very familiar hunting in a suburban park. A sub-species, Todiramphus sanctus vagans, that looks very very like our locals lives in New Zealand/Aotearoa as well.

NZ Kingfisher lit profile sharp bigger crop better

The New Zealand kingfisher

I started speculating on how the sacred kingfishers got over the Tasman but it seem their range is less about being blown off course on migratory treks than the epic distribution of another bird to which it is closely related – the collared kingfisher .  It’s a one less frequently seen in Australia – found only on coastlines in the northern half of Australia – and never seen at all by me so no pics. I got nothing!  Collared kingfishers (sometimes called the mangrove kingfisher) seem to be less generalist than the sacred, favouring mangroves and the forests immediately behind them – but has an impressive range.

In an article offering a genetic analysis of this species and its descendants in Australia, New Zealand and various Pacific islands, Michael Andersen and his colleagues describe as it as “the most widely distributed of the Pacific’s ‘great speciators’. Its 50 subspecies constitute a species complex that is distributed over 16 000 km from the Red Sea to Polynesia” (Andersen 2015).  The sacred seems to be one of the species that evolved from it.  Intriguingly collared kingfishers are no longer a migratory species, but Andersen speculates that “the migratory nature of T. sanctus is an evolutionary vestige of the ancestral Todiramphus lineage still exhibiting the colonization phase” (Andersen 2015).

Kingfisher and branches 4 long

One way or another, I shouldn’t have been surprised to find the sacred in our neighbourhood.  After all, I’ve always known you can witness sacred on the water, or in the forest, or in the suburbs.  Not everywhere, but in more places than you would think – as long as you remember to look.  In this case – in the bushes.

Further References

Andersen, Michael, Hannah T Shult, Alice Cibois, Jean-Claude Thibault, Christopher E Filardi, Robert G Moyle (2015) “Rapid diversification and secondary sympatry in Australo-Pacific kingfishers” Royal Society Open Science Feb 2(2)

Debus, SJS (2007) “Avifauna of remnant bushland on the Twee Coast of Northern New South Wales” Sunbird 37(2)

Lindenmayer, David B. , Michael A. McCarthy, Hugh P. Possingham and Sarah Legge (2001) “A Simple Landscape-Scale Test of a Spatially Explicit Population Model: Patch Occupancy in Fragmented South-Eastern Australian Forests” Oikos, Vol. 92, No. 3 (Mar), pp. 445-458

Loyn, Richard H., Edward G. McNabb, Phoebe Macak, Philippa Noble (2007) “Eucalypt plantations as habitat for birds on previously cleared farmland in south-eastern Australia” Biological Conservation 137 533–548

Smith, Peter & Judy Smith (2012) “Climate change and bird migration in southeastern
Australia” Emu – Austral Ornithology, 112:4, 333-342

Kingfisher light against pine background square

Not just splendid; better than superb

One of the brilliant things about living in deepest suburbia, in one of the very furthest places you can plausibly describe as “in Sydney”, is that a bushwalk is always around the corner. The direct route to the station might offer glossy black cockatoos hanging upside down above the mechanic’s car park, a mismatched pair of king parrots or a lyrebird, scratching around in the scrub behind the public library.

Lyrebird

The library lyrebird

But if you’ve got a bit of time to spare, you can take that trip to the supermarket or the railway station through another world – no cars, no leafblowers and a whole heap of birds.  A couple of minutes off the main road and you’re out of the ridgeline’s suburban streets and into the bush on the Hawkesbury sandstone slopes below.  Okay, it might take an extra half an hour to fetch that litre of milk but you never know who you might meet on the way.

Monday’s 2k walk back from the station (via the first part of the Lyrebird track that connects to the Great North Walk) featured a surprisingly bold whipbird, a New Holland honeyeater, red-browed finches and a sacred kingfisher on the hunt.

But the highlight of the detour was these guys – a posse of variegated fairy wrens.

Variegated male and female back to back square

Beautiful male variegated fairy-wren in breeding colours with a jenny wren

I wouldn’t have paid much attention to the flash of blue in the undergrowth, if I hadn’t had a heads-up from my birdwatching brother to keep an eye out for these fellas.  They’re easily mistaken for the superb fairy-wrens, which are more commonly spotted in parks and gardens. Variegated fairy-wrens, it seems, prefer denser cover and a wider range of trees and shrubs in their hangouts.  This patch was burnt off in the last couple of years, so the undergrowth thick but only waist high.

Superb blue wren in tree old long

Superb fairy-wren I prepared earlier

Obviously when those obsequieous common names were handed out to Australian fairywrens, the variegated was indisposed. Seems a little unfair since, if anything, the breeding males of this species with their blue, chestnut and purple feathers are, if anything, lovelier, more superb and more exceedingly splendid than their flatteringly named relatives.

Variegated wrens grooming wing crop

Two females and a male variegated fairy-wren

Until recently, I laboured under the impression that a group like this consisted of a harem of females with a dominant male.  The interactions I saw on my micro-bushwalk, suggested that this might be less than accurate…

No need for assertiveness training for this jenny wren at least.

Turns out, fairy-wren groups consist of a dominant pair and a handful of younger birds, including non-breeding males.  Fairy-wrens, like many other Australian species, are cooperative breeders. While the breeding female builds the nest and incubates eggs, the rest of the group – often last year’s brood – chip in to feed the new chicks.  The young males are apparently particularly good value on the snack provision front.

Superb fairy-wrens have been described as “socially monogamous and sexually promiscuous” (a bit like a National Party politicians!).  Females sneak off to mate with the local male that wears his high-visibility, high risk blue plumage the longest (it’s not just the birdwatcher that find the iridescent blues and purples more appealing than the brown “eclipse” plumage that the male fairy-wrens sport in the off-season).  Sometimes as many as 3/4 of chicks can fathered by a male outside the pair. Recent research suggests that’s less true of the variegated fairy-wren.  Counter-intuitively, perhaps, variegated jenny wrens seem to be less likely to “play away” when there are lots of helpers close at hand to help raise the young.

Variegated two males and female crop

Two males and a female – no idea what’s going on here.

I can’t say how unsufferably smug I am that I get to see these cool little birds on what is, essentially, the school run.  They make a compelling argument for active transport.  I’ve resolved to turn my back on the car and cram as much gratuitous walking as I can into my days. As you can see, the outcome can be lovely, splendid, superb or perhaps even variegated!

Variegated wrens male + 2 long crop tighter

Chestnut shoulders on display – male and two female variegated fairy wrens

Additional references

Diane Colombelli-Negrel (2016) “Female splendid and variegated fairy-wrens display different strategies during territory defence” Animal Behaviour 119 99-110

Allison E. Johnson and Stephen Pruett-Jones (2018) “Reproductive promiscuity in the variegated fairy-wren: an alternative reproductive strategy in the absence of helpers?” Animal Behaviour 139 171-80

Red backed fairywren male good but fairly distant over shouldercrop

Your bonus fairy-wren for reading to the end – a red-backed fairy wren spotted at Oxley Common in Brisbane

The bowerbird bachelors

You know life has been intense when an incident from the backyard in spring doesn’t make it to the blog until the tailend of summer.  Our backyard re-enactment of “The Bachelor” had to be at least four months ago because satin bowerbirds only do their courtship routines from April for September.  The bowerbird dating show was a while ago now, but it was a truly memorable occasion.

A couple of times in the past we’ve found some blue items – pegs, bottle tops – in the bottom of the garden, collected together and rearranged over a period of days in a mysterious and seemly significant way.  But this time the assemblage was visible from our back verandah.  We had ringside seats for the show.

Though he was decked our in the iridescent black of a mature male – something that only happens when satin bowerbirds are at least seven years old – our bachelor seemed to be new at this.  There was no signs of a bower per se, just his collection of pretty objects in an unsalubrious corner of the garden.   I spent a day on the deck “working from home”, watching him shuffling them around. The milkbottle/yellow leaf combination seemed to be a particular favourite.

After quite a bit of this faffing around, he had a visit from a female.

Green bowerbird on a log square

Female satin bowerbird comes to look around

Cue bending, twisting, flapping of wings, along with some impressive eye bulging.

Well, impressive to me but possibly not to the visiting female.  I know it’s anthropomorphic but this face screams “get me out of here!”

And indeed, within minutes, a second male arrived on the scene, having surveyed the situation from afar.  He had a look around, somewhat dismissively it appeared, and then abruptly flew off with the female in tow. I almost heard him muttering out of the corner of his beak “C’mon babe”.

Our bachelor, thwarted, seemed to decide that inadequacies in his collection of blue objects was the key problem.  My kids had helpfully (if problematically from a plastic waste point of view) scattered some colourful gee-gaws around the back patio.  Our guy seemed concerned that one of the “house” wattlebirds might have an eye on the azure ornaments that were key to his sexual success.  It was on.

Bowerbird v wattlebird great 1 cropped

One distinctly irked bowerbird

Having put the little wattlebird firmly back in its box, our lovelorn male returned with additional trinkets to pimp his bower.  But to no avail.

There were other visitors that afternoon, but despite sustained and prurient interest, I saw no signs of sexual congress and the next day there was no repeat performance although the blue objects remained in their inauspicious arrangement by the woodpile.

However, a couple of weeks later the abandoned pile of treasures received another inspection from a “green” – presumably a young male who hadn’t yet earned the glossy violet-black feathers of a grown-up.

He seemed to be practising his courtship display, favouring golden twigs rather than the milk-bottle/leaf combo.  He had that eye-bulge down pat already though.  I wonder if we will see him back – perhaps in the mottled black-and-green plumage – for the next season of the Bowerbird Bachelors.

Motherhood on a windy day

Kid with mum distant 2 wide crop

Last year two collared sparrowhawk fledglings made it out of the nest high in our neighbour’s pine tree.  This year it was just one.  It’s been a lot quieter around here.  No squabbling over snacks.  No shuffling along branches side by side or pratfalls high in the canopy.  No hightailing it after a sibling chasing a feed.

There’s been more adult and parent bonding, though. I rarely saw the adults and offspring together last year.  But a few weeks ago, in windy weather, I got to see them hanging out low in the trees by our drive, sheltering from the tossing branches.

Juvenile against bark close crop

The juvenile looked, by turns, absurdly sleek and adult, and fluffy and completely gormless.  Mum (or dad) seemed to be wrestling with the same conceptual problem – how grown up is this chick really?

Typically when the sparrowhawks catch a juicy white-faced honey eater or wattlebird chick, they call out, over and over again.  I’m not sure if this the dinner bell for partner or offspring, or just triumphant territory claiming.  They swiftly pluck the small bird they’ve caught and then gorily and fairly rapidly consume it.

But on this particular day, the adult hawk sat very still, prey gripped tightly, not taking even a bite.  The youngster lurked awkwardly nearby, apparently not sure what to do next.

Kid with mum lower

Eventually mum (or dad), probably irked by the local amateur photographer, flew to a higher perch in the trees.  But her prey, plucked, pink and gleaming, was still untouched.

Mum with prey 2

She was waiting. Eventually Junior flew up to join her.

He still seemed clueless about what she wanted him to do – as indeed I was.  I’m willing to have a guess, though.

Adult sparrowhawks start by feeding their young little shreds of meat – the avian equivalent of pulled pork, I guess.  I have heard the adults teach the fledglings to catch little birds mid air by dropping little snippets of prepared flesh to them on the wing.  This youngster was definitely not in possession of that skillset.

Mum and kid with prey high 3

But I think dad (or mum) was trying to give the not-so-little little one a low-stakes chance to prep the dish for her (or him)self.  But it certainly wasn’t happening on this occasion.  Young blood had a good look, then stumbled past and took off, not even having a tiny go at flesh-tearing.

Juvenile from behind looking over shoulder crop

To be honest, I’m really pretty worried about this young one.  I’ve been working from home a lot lately, and every morning, I hear sparrowhawk calls, and I race up the drive with my camera.

But it’s just the adult I see, calling and calling and calling.

Further references

Barnes, C.P. and Debus, S. (2014) “Observations of the post-fledgling period of the collared sparrowhawk (Accipeter cirrocephalus)” from The Sunbird (2014) 44(1): 12–23

 

More sparrowhawk stories from our backyard

The end of the brush turkey plague? The battle of the baby birds….

There’s a collared sparrowhawk nesting in our garden…. or is it a goshawk…?

Our sparrowhawk summer

The teenagers start hunting for themselves… Sibling rivalry amongst the young serial killers….

Sex, nests and dogfighting

The very big fish

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Mulloway on the rocks by Joe Crafts Bay

I’m a fish idiot.  I see them all the time as I paddle around the Hawkesbury – grey, striped and translucent; foot long granddaddies heaving themselves out of water and hundreds of fry flicking the surface like tiny scaly synchronised swimmers .  But don’t ask me what sort of fish they are, where they hang out, or anything else about them really.  I don’t eat them, or hunt them, or keep them as pets so somehow my brain spontaneously ejects all information about them.

But it was hard to ignore a fish as big as this, splayed out on the riverside rocks near Joe Crafts Bay.  Especially given the spectacle of the local white-bellied sea eagles trying very hard,  but ultimately not hard enough, to carry this giant juicy snack to a convenient spot in the treetops.

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White-bellied sea eagle trying to fly off with a very big fish

This fish was too much even for the second largest raptor in Australia to carry off to eat in peace.  Male sea eagles can weigh as much as 3.7 kilos, females half a kilo heavier, with wingspans of two metres or more.  But this great big fish, I have been assured by expert fishermen, was a mulloway, a giant of coastal waters that can weigh 60 kilos and grow to two metres long.  This one was a tiddler, maybe only two or three feet in length (I guess.  But then I’m the kind of person who has to try two or three lids before successfully covering a saucepan, so I could be wrong).  But the sea eagle still couldn’t wrangle it safely into the trees. Trust me, it tried.  Take off was aborted several times.  And then a boat with some noisy humans came and anchored inconveniently close to this enormous and tempting snack.

Blue boat

The sea eagle flew off, disgruntled.  But it didn’t fly far.  Or more to the point, they didn’t fly far: in fact, there were three sea eagles keeping an eye on this feed – a pair and a youngster I labelled “Itchy”.

The boat moved along, after a while – obviously no other mulloway were coming up from the deep that morning. Before the sea eagles got wise, someone else decided on seafood for breakfast.

The raven and its mate tried to keep the great big fish to themselves, but in the end, might is right on the river it seems.

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Pair of Australian ravens chasing a sea eagle

I’m not sure if Itchy got a look-in, but the sea eagle pair both got a decent meal, taking it in turns to run the gauntlet of the river-traffic (including a nosy kayaker with a zoom lens).  One bird ate warily while the other stood guard in a nearby tree.

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White-bellied sea eagle enjoying mulloway for breakfast

They’d hardly made a tiny dent in the corpse of the mulloway by the time a second boat came along to break up the party.  I’m sure another meal happened later in the day, but I try to be out of the water by the time the roar of powerboat engines drowns out the whizz and plop of yak-fishermen casting.  One less bothersome boatie for the sea-eagles to worry about.

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Boat off Joe Crafts Bay

I’m sure this mulloway has a story.  If the white-bellied sea-eagles couldn’t take off with this whopper fish, it’s hard to imagine how they could have caught it and lifted it from the water.  How did this beauty end up, forlorn, on the river-side rocks?  Surely no human fisherfolk would leave such a prize behind?  My fishing friends tell me that the great mulloway, jewels on its back glimmering in the water, is a fish to dream about and pursue – after dark, in the deepest holes in the river.  And good eating too.

Stocks of these big fish crashed by the early noughties, burdened by commercial and amateur fishing.  The minimum catch size for recreational fishing went up from 45 to 70 cm long, so maybe this one was caught but found short of the mark (like most of the mulloway hooked by recreational fisherfolk).  Released, perhaps, already wounded, destined to wash up on shore, breakfast for the ravens and the eagles.

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Thanks to Denis Crowdy and Peter Doyle for fish identification and mulloway tales.

Other posts about the raptors in our beautiful backyard

Sibling rivalry as the young collared sparrowhawks in our neighbour’s pine tree learn to hunt…

The world’s fastest bird catches a meal

Three whistling kites, two sad islands

Encounters with the local eagles

Into the matrix

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A busy day at the bullrushes by Terry’s Creek for this brown gerygone.  It really got into  a frenzy as it threw itself around trying to tug away the requisite materials for nestbuilding.

Although they’re quite common up and down the east coast from far north Queensland, down to Victoria, where they’re actually expanding their range, this is the only place I’ve seen gerygones.  Half-way through my daily commute along busy Epping Road in suburban Sydney, in line of scrubby woodland only a couple of hundred metres wide flanking a malodorous creek  in a valley awash with weeds.  But there’s plenty of cover, a water source, and the bushland stretches maybe three kilometres along the creek, all the way down to Lane Cove National Park.

Gerygones are the kind of little insectivorous bird that do okay in quite small patches of suburban reserve, but absolutely don’t make the leap, in the words of Patricia Hodgson and Richard Major “into the matrix”.  The urban matrix, that is.  Some of the other birds I see regularly at Terry’s Creek – the white browed scrubwren and the red-browed finch – are quite happy hanging out in the scungy waste ground next to railway lines or dank weedy gullies, but are less keen on suburbia.

For some reason, silver-eyes are an exception – they’ve taken the blue and the red pill.  You find them both in and out of the urban matrix in “almost any woodland habitat“.  This one and his gang blithely flew in to have a nibble on a riverside pittosporum as I stomped around only an armslength away.

Silver eye and flower squarer

Silvereye in pittosporum

Some of the other locals at Terry’s Creek do sometimes visit gardens and backyards, but not ours (sniff).  I’m pretty sure our “house birds”, the resident red and little wattlebirds, keep them away. This week I’ve seen the little wattlebirds have a go at putting the frighteners on some much heftier residents.

Satin bowerbird at drink with wattlebird good crop

Head to head between a male satin bowerbird and a little wattlebird

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And it’s on!

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Just before the wattlebird bit the kookaburra on the bum!

And we’ve worked out why the wattlebirds are so aggro this weather.  Only a couple of metres from our backdoor, at eye level, right beside the path to the chook run and the washing-line, there’s a nest in the middle of one of our banana trees.

If you made an extensive search around the yard to try to find a place more exposed to human influence you’d be hard pressed to find one.  Tobacco fumes constantly waft around the nest from the chain-smoker on the back verandah, and children run past shouting maybe ten times a day.  More often, now we’ve spotted the nest and the two brown speckled eggs inside it.

The incubating female has a genuinely terrible approach to camouflage.  Whenever human is nearby, popping into the laundry or watering the herb garden, she points her beak to the sky and stays very still.  She’s pretending to be a stick, I think.  A surprisingly bird shaped stick with a beady, watchful eye.

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Female wattlebird incubating eggs in our banana tree

Wattlebird tail and banana crop

The tail’s a bit of a give-away as well.

Initially I figured that the wattlebirds picked this impropitious spot to raise their young because they were, frankly, a bit dim.  But then I thought back to last year’s summer of the sparrowhawks – the sheer number of chicks I saw eviscerated and the dramatic drop in local wattlebirds population at that time.

Now, the collared sparrowhawks seem pretty laid back about humans, spending more energy guarding their nest from raids by currawongs and channel-billed cuckoos than worrying about our comings and goings. But even so, I’ve never seen them perching on the back step or checking out the laundry.  So maybe the wattlebirds aren’t so stupid. Perhaps they’ve figured its safer to raise your young around the slow-moving noisy bipedal predators than the airborne ambush-hunting ones.  They’re not just surviving in the matrix – they know how to hide there.

Sparrowhawk light on beak crop

Collared sparrowhawk on the look-out for prey

References

Woods, K.A. 1996 “Bird assemblages in a small public reserve and adjacent residential area at Wollongong, New South Wales” Wildlife Research 23 605-20

Hodgson, Patricia, French, Kristine and Major, Richard E. 2007 “Avian movement across abrupt ecological edges: differential responses to housing density in an urban matrix” Landscape and Urban Planning Vol 79 Issues 3-4, pp.266-272

 

Blue eyes and biteys

Brown cuckoo dove eye

The glamorous eye of the brown cuckoo-dove

We’ve had a visit from some old friends this week: a gorgeous pair of brown cuckoo-doves. who each took a constitutional around our patio before reconvening for an exhaustive mutual preening session above the chicken run.  They’re rainforest birds, but don’t mind wandering away from damp gullies in search of tucker – fruit, mostly, along with seeds and the occasional flower blossom.  You’ll often find them in disturbed areas and roadsides, feeding off weeds like lantana and wild tobacco, so what with the great swathes being carved, legally and illegally, through East Coast bushland, they’re doing better than many other forest loving critters these days.

And they are expanding their range as well.  Back in the day, Sydney was the southernmost point you’d reliably find a cuckoo-dove.  No longer.  Just a continuation, I guess, of the species’ earlier journeys from the north, where several close relatives still live. In fact, the amboyna cuckoo-dove of Indonesia  and the Sultan’s cuckoo-dove of Sulawesi were considered part of the same species only a couple of years ago when I last wrote about these portly visitors.

Cuckoo dove looking back from water crop

Brown cuckoo-dove quenching its thirst in our bird bath

I’m not sure what attracted them to our place, now we’ve executed the humungous broad leafed privet that used to lure them here.  The fruit-bearing natives we’ve planted to replace this nasty weed – lillypillies, blueberry ash, koda, bolwarra, native gardenia, small leafed tamarind, brush muttonwood – are all too teeny to offer snacks of any significance.  I spotted the cuckoo-doves innocently drinking from the bird bath but I suspect they may also be implicated in the overnight disappearance of the fruit from our mulberry tree.  Though since I chose to plant the mulberry right next to our washing line, maybe that’s a good thing.

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For me, cuckoo doves are all about those beautiful blue eyes, though their exceedingly long tails are also a feature, helping them with fruit nibbling acrobatics, and at one time  earning them the name pheasant-tailed pigeon.  But as far as science is concerned, they’re mainly interesting for their body lice.

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A female brown cuckoo-dove being groomed by its mate

Normally, it seems, parasites co-evolve with their hosts.  A family of lice tend to be found only on one family of birds (and in fact, each species of lice normally exclusively hang out with one species of bird).  But the Ischnocera – the family of louse that this pair are trying to remove from each other, in a rather romantic manner – can be found on all manner of birds – not just pigeons and doves, but also pheasants, quails, partridges and indeed megapodes.  Though not apparently our local megapode, the brush turkeys, or “the bloody bloody brush turkeys” as they are usually referred to in our household.

But if cuckoo-doves brought their own personal payload of body lice with them when they moved south to Australia, they also do a fine job of cleaning up some other pesky insects –  fruit flies.  Along with ripe fruits, cuckoo-doves gobble up loads and loads of larvae.  One researcher went so far as to say that vertebrates like brown cuckoo doves are the “natural enemies of fruit flies” (Drew, 1987, 287), words to bring joy into the heart of a sub-tropical gardener.  But further reading crushes these dreams.  Yes, cuckoo-doves, (along with rats) made a huge dent in the fruit fly population.  But unfortunately, they did so in the course of eating most of the available fruit.

I guess, then, its lucky I’m hooked on the looks of our frugivorous visitors, and I’m not banking on them for pest control.

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The blue eyes of the brown cuckoo-dove

Additional references

Drew, A. J. I. (1987) “Reduction in Fruit Fly (Tephritidae : Dacinae) Populations in their Endemic Rainforest Habitat by Frugivorous Vertebrates” Australian Journal of Zoology 35 283-8

Gibbs, David (2001) Pigeons and Doves: a guide to the pigeons and doves of the world, Bloomsbury Books

Gosper, Carl and Gosper, Dennis (2008) “Foods of Pigeons and Doves in Fragmented Landscapes of Subtropical Eastern Australia” Australian Field Ornithology, 25, 76–86

Johnson, Kevin, Weckstein, Jason, Meyer, Mathys (2011) “There and back again: switching between host orders by avian body lice (Ischnocera: Goniodidae)” Biological Journal of the Linnean Society, 2011, 102, 614–625