Loves and leaves

Yet more lock-down luck.  Company, space, a rambling garden desperately requiring attention, three national parks in walking distance and enough devices to make home learning while working full time quasi-feasible – I already have plenty to be grateful for.  And now, the collared sparrowhawks are back, getting friendly in the neighbour’s pine tree.  They have perfect timing.  It’s just at that point in the lockdown – eight weeks in – when even the most avid homebody/hoarder is running out of distractions.  I’m not saying that trying to get a photograph of the local raptors having sex is my only reason to get out of bed in the morning, but it is a reason.

Morning does seem to be the time for it.  No pictures – this is a family-friendly blog, after all (nothing to do with me being slow on the draw with the zoom lens).  When the sparrowhawks are around, we usually hear them soon after sunrise.  There’s relentless calling from near the top of a tree – mostly, I think from the female.  The male perches, in a diffident kind of way, in a nearby branch.  Then they’re at it, with a brief distinctive flurry of calls.  Afterward, the male shuffles or flaps a distance away on the branch, studiously avoiding eye contact.

The one time I managed to watch the process from go to whoa, afterwards the female chilled out in more or less the same spot high in the pine tree, catching the morning rays, and keeping an eye out for small bird snacks.

Meanwhile, what I think was the male (though this might be a gender stereotype), started attempting some DIY.  Collared sparrowhawks build a shallow nest of stick, high in the canopy, and line it with fresh leaves each year.   This pair seem to be using the same spot in the very top of the neighbour’s tree, notable for its inconvenient lack of a line of sight from my place.

Watching the male gathering construction materials, I’m once again reminded of the limitations of the sparrowhawk’s modest beak and  delicate legs for this kind of building work.  The bird seemed to spend a lot of time eyeing up flimsy looking twigs and then flailing around with its wings in an attempt, mostly unsuccessful, to break some bits off.

 

As you can see, this bird had a red-hot go at getting some twigs from dead branches on one of the usual pine trees.  Eventually, however, the nest-building one of the pair got a bit experimental.  The liquidambar in our front yard – stripped of its leaves by winter, and not so good for ambush hunting – got a visit, solely for construction purposes.

However, some of the neighbour’s shrubs with thin whippy stems and fine needle-like leaves and seemed to be nest-material of choice.

Even so, the process was neither dignified nor ubiquitously successful.  These photographs are both fails.  Photographic fail – frustrated nest builders crashing around in the shrubbery are not an easy capture.  Also, nest building fail – neither of these twigs made it back to home base.  I did, however, see more success on another round of visits to this same bit of greenery the next day.

And they’ve kept at it, with occasional success.

Watching the nest-reno in action has made me reflect on our luck in having these gorgeous critters hanging out nearby – and  on what kinds of habitat create that kind of luck.  Sparrowhawks need tall trees to nest in. This pair (assuming it’s the same one returning each year) nest in one pine tree, and use a sequence of three others nearby as regular hunting spots.  Thanks to lots of greenery, we have loads of undemanding smallish birds on the premises of the right size for raptor snacks – little and red wattlebirds, chicks of the ubiquitous brush turkeys and, of course, loads of bloody noisy miners.

I’ve definitely seen the sparrowhawks devouring birds that we don’t see at our place though – I’m sure they hunt in the national park that’s 500 metres down the hill.  Here’s one of the fledglings from a couple of years ago, chowing down on what I think is a white cheeked honeyeater – I’ve never seen one at our place, but they’re pretty common in the bush not far away.

In the two seasons when they successfully raised chicks, the fledglings seemed to practice short hop flights from one pine to another.  The liquidambar in our yard is an occasionally hunting spot in summer, and I do wonder if the cicadas that appear to feed on its sap in mid-summer offer useful meals for the chicks.

And then there’s the necessity for nest-lining trees with appropriately flimsy branches.

Sparrowhawks are generalists and live all over the place – everywhere except the most arid regions of Australia.  So they’re obviously not too fussy about the finer details of their immediate environment.   They’re pretty low key around people and don’t seem to mind suburbia.  I wonder how much they need the bushland I’m finding so sustaining in lock-down.

The sparrowhawk pair isn’t the only birds aware of the value of this bit of floristic real estate, though.  I’m pretty sure currawongs took some of the sparrowhawk’s nestlings in previous clutches, and I wonder whether the presence of these smart and social predators has kept the pair away for the last three years.  But yesterday a bit of argy-bargy with another of the locals – a family of kookaburras.  I’ve been seeing them around a bit more than usual this winter, surveying the scene from our dawn redwood and the remnants of our long-dead pine trees.

Yesterday I wandered up the drive to see if I could capture any trysts or DIY activity, and there was a cheeky kookaburra in the exact  spot I saw the sparrowhawk chilling in the day before.  And another, on a second favoured hunting perch, further up the tree.  The sparrowhawks were in the vicinity, but as soon as one landed in that pine, the kookas were after it.

Here’s a deeply discombobulated sparrowhawk, catching its breath a few metres away.  A minute later, the kookaburras were back and the pair of raptors hightailed it into the distance.

I feel stupidly anxious about this, for some reason.  Every year about this time, we hear the sparrowhawks and I’m always hoping they’ll hang around and try to raise some chicks again.  For the last couple of seasons we’ve been disappointed.  But this year, silly as it seems, it feels a bit more high-stakes, and not just because we’re stuck at home with near-infinite opportunities for bird watching.  It feels symbolic even.  If this avian couple’s romance and nestbuilding comes to fruition, somehow it signifies that my little family will stay safe here too, safe and sane and together.  And if not… these things somehow seem less assured.

But of course, that’s a nonsense.  Birdwatcher magical thinking.  If the sparrowhawks find a better place to nest, and our trees get a different set of inhabitants, there’ll still be things to do, birds to listen out for, a different family to get to know.

The previous adventures of our local sparrowhawks

Sex, nests and dogfighting

Collared sparrowhawks vs Pacific bazas

Motherhood on a windy day – the sparrowhawk chick grows up

Death and sibling rivalry

Sparrowhawk summer

Battle of the baby birds

Welcome beautiful stranger

Crested hawks for Christmas

Every birdwatcher has a list of sightings they dream about (if that sighting is accompanied by a National Geographic front-cover-worthy picture all the better).  For the cognoscenti – sophisticated, proper twitchers – this list seems to feature rare, endangered or hard to spot critters, that may or may not be kind of boring to look at.  But for the crass newbie like myself, bling is important. Flashy, that’s how I like my bucket list birds.

For a long time, a decent look at the gloriously multi-coloured (but annoyingly canopy dwelling) spotted pardelote was top of the list.  A camping trip to the fabulous Wolgan Valley a couple of years back ticked that box.  Worth sweating my way up a hill to look down on the magic of the diamond-bird.

Obviously rainbow bee eaters were on also on the list, until my parents moved to Bingara in on the northern slopes of NSW, a town where grey nomads and bird nerds duke it out for dominance in the local economy.

Since then, my top two have both been raptors.  There’s the black shouldered kite with its glorious red eye and hauntingly regular presence along highways. I see it often on long road trips, hanging out near boggy pasture land, but getting a photograph seems to require a willingness to pull the hand brake on at high speed in the middle of a major road.  I’m not saying I won’t do that, but I’m still working myself up to it.  And then there’s the absurdly excellent Pacific Baza.

Stunning golden eye – tick.  Dramatic black-and-white belly stripes – tick.  Elegant flight, even acrobatic during the mating season – tick again.

And, absurdly, a crest – its nickname is the “crested hawk”.  Does it get any better than that?  I think not.

I was hugely excited when I spotted what I thought was a baza in our neck of the woods a few weeks ago – zipping past and disappearing into the leafy top of a liquidambar tree.  Birds seem to be attracted by a pheromone released by amateur photographers who are not carrying a camera.  Certainly that was the case on this occasion.  Lacking any visual evidence of the encounter, I figured it was a wish fulfilment sighting.  Probably one of the collared sparrowhawks, also stripy chested canopy dwellers.   They’ve been back on the scene at our place over the last month or two, hanging out in the top of the neighbour’s pine tree, bragging about their kills and having brief and frustratingly hard to photograph sexual encounters first thing in the morning.

But this week – a late Christmas present.  My outstanding neighbours Laura and Steve texted to say that the mysterious bird they had previously seen lurking in a melaleuca tree had made at a guest appearance by another neighbour’s pool, and been IDed.  It was a Pacific baza.

It’s a miracle that I didn’t get hit crossing the road as I raced over to their place.

The trip to casualty that could have ensued would have kept my from not just a single baza but a little family – a pair (I think) and a large and whiny fledged chick.  Naturally, they were lurking in the very top of the tree, and of course, my skill-set with my flash new camera meant that my career as a natural history photographer is not going to take any great leaps forward.

Adult Pacific baza avoiding eye contact with a juvenile

Blurry as it is, I interpret the body language of the parent here as indicating an unwillingness to provide further snacks.  We saw both adults make a few short flights, and at least once definitely offer the youngster some prey.  The juvenile whined without interruption, inching along the branch towards the adults, ducking its head and restively half-opening its wings.  This parent avoided eye contact and eventually flapped off to a separate spot in the tree.   A couple of weeks after they leave the nest, apparently,  juvenile bazas stop getting food provided by their parents, so I guess this was what was playing out here.  Baby Baza was certainly less than happy.

Juvenile baza (I think) in a huff

To say I was ecstatic to see the family of bazas within 100 metres of my front door would be to underestimate my degree of excitement. But then a troubling thought struck me… would the presence of the bazas harsh the buzz of the sparrowhawk pair that I’d seen canoodling on my side of the street?  The pair appeared soon after a fierce storm that tore some big branches in our backyard and might well have trashed a nest somewhere down the road.  Would the appearance of the bazas spoil the chance of a late-breaking bit of nest building?

Like Pacific bazas, sparrowhawks spend a lot of time in the treetops.  They’re ambush hunters, lurking in amongst the leaves ready to burst out and pluck small birds from the sky.

They’ll take sparrows (perhaps unsurprisingly), mynahs and miners, mudlarks and wattlebirds, even birds as big as crested pigeons or crimson rosellas. Here’s a pic I took recently of a sparrowhawk trying to choke down the remnants of a leg of a bird.  See the toes poking out of its beak?  I watched it pacing up and down on the branch, wiping its beak repeatedly and generally looking a bit agitated.  I note that the left over leg remained untouched and I can kind of understand why.

Maybe its not surprising after this kind of experience that a sparrowhawk might want to ring the changes, diet wise.  And in fact, sparrowhawks won’t say no to a bug or two.  A Canberra study found half of sparrowhawks’ prey, by the numbers, were snails, spiders or insects, with Christmas beetles and cicadas a particular feature.  All those insects weren’t too filling – they made up only 2% of the biomass.  But still, that interest in insects could them into competition with bazas, which eat fruit, frogs, lizards and snakes, grabbed from the foliage at the tops of trees, but especially like stick insects.

Yet another thing to inspire delight in bazas – an eccentric specialist diet.  When I was looking at this critter in the Berowra train station, I wasn’t thinking “if only I ripped that to bits it would make a toothsome snack for my children”.  But if I was a baza, I would have been.

However, larger insects are a favourite of Pacific bazas, while sparrowhawks seem to go for nothing bigger than a huntsman or a cicada.

Disappointingly, the bazas have disappeared from the paperbark in Steve and Laura’s drive, for all its proximity to a refreshing backyard pool and ample opportunities for hunting in the tops of tall trees, undisturbed by competition for their favourite phasmids.  They’ll probably be nearby – these raptors aren’t migratory and Berowra sounds pretty close to their ideal habitat:

tropical and sub-tropical forests and woodlands, largely within 300km of the coast. In the breeding season they frequent tree-lined watercourses, rainforest, sclerophyll forest and tall woodland, but range widely following nesting to lower ground, when they may visit urban parks and gardens.

One birdwatcher in Queensland followed the reproductive fortunes of a pair of bazas as they nested in a series of different trees within a couple of hundred metres of his house on his property for a decade.   So, no National Geographic cover photo as yet but I remain hopeful.  2020 really was a dud year but with the crested hawk in town, who knows what fine things could be in store for us in our backyard next year.

Raptor encounters in our neighbourhood

Sex, nests and dogfighting – sparrowhawks set up house in our local pinetrees

Sparrowhawk sibling rivalry – baby serial killers learn to hunt

An eagle in suburbia – a wedgetail on Berowra Creek

The very big fish – sea eagle vs mulloway

 

References

  • Briggs, Allan (2018) “Breeding biology and behaviour of a pair of Pacific Bazas ‘Aviceda subcristata’ in central-coastal Queensland over 10 years”. Australian Field Ornithology, Vol. 35, 2018: doi: http://dx.doi.org/10.20938/afo35095101.
  • James, P. (2004). The breeding cycle of a pair of Pacific Bazas Aviceda subcristata in south-eastern Queensland. Australian Field Ornithology 21, 133–140
  • Olsen, Jerry, Judge, David, Trost, Susan and Stephen Debus (2018) “Diets of breeding Brown Goshawks Accipiter fasciatus and Collared Sparrowhawks A. cirrocephalus near Canberra, Australia and comparisons with other regions and raptors” Corella, 42

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