Black-eared Cuckoo

It has been a rather hectic past few weeks, what with the Tawny Frogmouths fledging and doing a bit of general bird-watching around the south east of New South Wales and the ACT. I'll post as much as possible over the next few weeks, but meanwhile here are some shots of a Black-eared Cuckoo Chalcites osculans, which was caught during a regular study of birds at Charcoal Tank Nature Reserve, on the 9th November.

The trip was led by Mark Clayton as usual and in over eighteen years of study this was the first of this species caught there. The Black-eared Cuckoo is a national widespread bird, but rather uncommon and can be difficult to find by birdwatchers. So I felt it appropriate to add a few pointers on the bird's plumage to help others identify one if they do ever have the fortune to come across one.

The distinctive face of a Black-eared Cuckoo

There is no mistaking the bird as a cuckoo in Australia, but a couple of us with experience of northern hemisphere birds considered it as resembling a Northern Wheatear, due to its soft orangy plumage and dark eyestripe.

This bird had a rich pale orangy breast - a deeper colour than the expected buff

The under-tail barring is characteristic of the Bronze-cuckoo genus Chalcites.

The coverts on the wing were well worn and faded

The bird was quiet in the the field when we saw it and in the hand after it was caught, which might explain its elusiveness.

There was very little contrast between the underwing coverts and the faint wing bar across the primaries, secondaries and tertials

I did not see the underwing bar as being particularly noticeable in the field, nor in the hand. But the white tips to the tail caught my eye immediately.

The light grey rump contrasted with the back, wing and tail.
And the tail showed distinctive fault bars.

The overall glossy sheen on the back and wings was like those on other Bronze-cuckoos, although not so bright, nor green as in the other species.

Spotlighting

Male Plains Wanderer - difficult to see in grassland, even under spotlight

Last week I was out with Peter Cosgrove on a bridwatching trip organised by Philip Maher and led by his colleague Robert Duncan. We looked around for honeyeaters, chats and waders in the late afternoon before driving over some grasslands looking for Plains-wanderers Pedionomus torquatus with a spotlight. These birds are not nocturnal, but they are easier to see at night for during the day, they crouch when approached and become very difficult to see. At night they stand still when under a torchlight.

The female is brighter coloured with a distinct collar and rufous bib

Other birds seen during the night trip were Banded Plover Vanellus tricolor, Inland Dotterel Charadrius australis, Stubble Quail Coturnix pectoralis, Little Button-quail Turnix velox and Australian Pratincole Stltia isabella. 

Stubble quail - female

All in all, a very successful trip and thoroughly recommended for anyone who would like to experience a night out with the birds in the Riverina area of New south Wales.

Australian Pratincole

Frogmouths in the sun

A Tawny Frogmouth basks in sunshine

Ever wondered what tawny Frogmouths do when we aren't watching, and they don't adopt their broken branch pose? Following on from the previous post, I thought I should add some images of how frogmouths hold themselves when not in alarm, as usually seen by humans.

Typically, they sit on the sunny side of trees where they can bask in the sun. Frogmouths can go into torpor during the day when they are not active and exposure to maximum sunshine, especially in winter, helps them thermoregulate. When sitting in the sun, they hold their breast up towards and face onto the sun. And they tilt their head back and fluff out their feathers, which are held tight against the body when in branch-pose.

Well shaded eyes

Frogmouths don't hunt by day and they hold their eyes closed when their head is angled towards the sun or when approached. But at other times when they are looking around, generally watching, their eyes are well shielded from the sunshine by thickly feathered eyebrows. As their eyes are likely better tuned to night vision, this probably aids their daylight vision, by shading them from bright direct light.

Quite frequently, they will bend their head right back and over a shoulder, spreading the feathers on their neck and breast wide open. This seems to be to allow maximum sunlight or heat reach their skin. In the photograph below, the bird has tipped her head to her left and her bill tip and nasal bristles can only just be seen protruding from the fluffed up plumage.

Maximised sun basking

A close call

A Tawny Frogmouth sits on its nest, hiding from me, not the Crimson Rosella 

Tawny Frogmouths are well known to adopt a branch-pose to hide from potential predators, as they usually do when approached by a human. So it was illuminating to watch what they do when an animal predator approaches them.

Yesterday, this bird was unconcerned when a Crimson Rosella landed on its nest branch, but quickly slipped into the angled pose as I drew nearer. Then while I was looking for the female roosting a few trees away, she began to call in a low oom oom. This is most unusual as they do not normally call at all when approached. And then she started to fidget, leaving her branch-pose and shifting along her perch. Her eyes were wide open, they keep them closed when approached as part of their concealment, and I was wondering what was up, when I heard a cawing back beside the nest.

The female frogmouth in alarm

Two Australian Ravens were hopping about in the tree next to the nest, staring at the bird on the nest, which was back in a branch-pose. She had obviously seen them approach the nest well before me and was anxous as to what to do. For frogmouths are loath to fly in daylight, yet she seemed to want to help chase off the ravens from her nest.

Two Australian Ravens investigated the frogmouth on the nest

The male by then had his hackles partly raised, and his bill was slightly open. I suspect that he might have been giving a low hissing call as the ravens drew closer. I am sure they had identified him as a bird on a nest, but perhaps his partial threat display was enough to make them unsure. We can't tell, but they flew away to join the rest of the roving flock which they were part of. Hopefully not to return. 

Fortunately they flew away

Fledging Frogmouths

A Tawny Frogmouth fledgling basks in the sun

The first Tawny Frogmouths fledged at the weekend, with one chick leaving the nest a day before its siblings, which left the next day. So, a brood of three from the earliest nesting attempt of the year, by the same pair which laid earliest last year and reared three chicks then too.

Meanwhile its dad continues to brood two chicks in the nest on the next branch

The female was sitting low in a branch and was most un-noticeable. Then once they had all fledged the whole family moved into an adjacent tree. They will continue to move around their home range from now on, roosting in a different spot most days.

 

And mum watches on in-obtrusively