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Wednesday, 3 December 2014

Superb Fairy-wrens in the garden

The adult male fairy-wren with a woodlouse
A pair of Superb Fairy-wrens Malurus cyaneus have just fledged a brood of chicks from a nest in our garden, outside our bedroom window. The nest was set under an old lavender bush, woven into the mesh of grasses and twigs. It was not much more than a see-through domed cradle for the eggs with the roof for concealment and a thin lining of fine grass and downy plant seed cases to support the eggs and then chicks.

The female creeps towards the nest, ever watchful for predators
The birds were accustomed to me and other people moving about the garden and carried on feeding the chicks while we were close, so I took the opportunity to capture a few images of these stunningly beautiful garden birds.

The large brood of four nestlings begging for food
I spent less than an hour watching the birds feed their youngsters and in that time they made fifteen trips to the nest, the male seven and the female eight times. They brought in a variety of items and I was surprised at the large size of some the prey, the grasshoppers and butterfly being the biggest.

The chicks were about ten days old and well feathered. They all fledged three days later and are now flitting around the garden following their parents in the ever busy search for food.

The male brings in a caterpillar
The female seemed to have the knack at catching flies for she brought in four during the watch.

The female brings in a fly
And she caught a tiny hoverfly.

Then a hoverfly - tricky to catch?
It was such a delightful experience to sit quietly next to the nest while the birds went about their business. Real live wildlife action in the garden. There is no need to travel thousands of miles to see spectacular animals, simply stop and take notice of what is going on all around us, even in the cities, there is something going on somewhere. Who knows what we'll witness next. Just take the chances when they come.

The male brought in two grasshoppers
I thought the male was specialising in the larger items, until the female brought in a blue butterfly, the perfect colour for such superbly blue birds.

A beautiful meal for one of the chicks

Monday, 24 November 2014

Hot Frogmouths

The youngest fledgling was on the same branch as its parents
There were some hot days in Canberra during the past week and the birds were feeling the heat. While I was checking on the fledging success of the Tawny Frogmouths in my study, I took a few shots of this family as they know me well and are quite confiding. The adults and the youngest chick were on one dead branch and the other two chicks were up in a nearby tree. The threesome were more discrete, the two others were a bit obvious as their white downy juvenile belly plumage was a bit of a giveaway when seen from below. Fortunately most predators would approach from above, especially Brown Goshawks, so they would be less obvious to them.

The chick was snuggling into its father's shade to escape the beating sunshine
Although the dead branch was a good place to sit for concealment, with their superb cryptic plumage, the open branch was exposed to the sun and the chick there was feeling hot. It was sitting close to its father who shielded it from the direct sunshine. All the birds were fluffing open their feathers and holding their bills open to cool down. This showed off the size of those big wide beaks - rather impressive.

All of the family were gaping wide to cool down - this is mum
The young birds had left the nest a few days before and they could fly quite well, enough to flutter from tree to tree and they were now over a hundred metres from the nest. They would still be dependent on their parents for food though, for another few weeks at least while their feathers fully develop and they gain stronger flight muscles.

The two older fledglings were sitting in a nearby tree - growing feathers are heavy as the quills are full of blood, so this bird is relieving the strain of their weight by drooping a wing
Cool Possum

She was cautious enough in the daylight to only peek out of the box
It was a bit warm yesterday in Canberra, topping at 39 c. And while I was in the garden giving the chickens and wild birds some fresh cool water I heard the possum fidgeting in her box, so I gave the box a quick squirt from the hose to cool it down - it was catching direct sun at the time. Then when I stopped I heard her give a sort of brwuff, a bit like a dog that wants to pay with a stick, not the commonly heard back-throat growl which brush-tailed possums give when disturbed. It sounded like she had liked the water splashing into the box.

She turned her face up into the spray, deliberately catching the water on her face
So, I gave a squirt directly onto the box and she quickly raised her head to the entrance. Whereupon, she happily lifted her head to catch the spray. The camera was handy, so I took a few shots. Then as I didn't want to soak her fur, I stopped, and she gave a me a look which said something. I don't know what, although she seemed to want more. I'm sure her fur is waterproof to a level far above what I gave her, but I left her with that and walked away while she just sat there watching me with a puppy expression.

She looked so calm and relaxed after her shower

Wednesday, 12 November 2014

Tawny Frogmouth fledglings

Three Tawny Frogmouth fledglings gather on one branch
Most of the Tawny Frogmouths in Canberra now have fledged young and I have been out watching them, to count the prey brought to the chicks by the adults. Although they have left the nest they are still very dependent on the adults, as they will be for about a month. This brood of three roosted during the day in separate trees then gathered in one after dusk when the adults began bringing in food.

The adult female brings in food 
The adults fed the chick which begged loudest first, not that their begging calls are loud. This is more of a rough rasping, coughing call, not shrill like that of most diurnal species' chicks. This is probably an adaptation to reduce the risk of attracting nocturnal predators such as owls which can detect prey by listening for such sounds.

The adult male lands with more food - one chick is fed a t a time, while the others watch on
The adults brought in food every few minutes for the fist hour, then gradually reduced this as the fledglings eased off their begging. Slowly they settled down and remained still most of the time apart from occasional wing stretching exercises. I could tell when an adult was approaching with food as the chicks would see them coming before me and begin fidgeting and calling again.

I use flash to photograph the prey which I can identify later at the desk
I watched under the light of the full moon and I could see the adults hunting not far off as my eyes quickly adjusted to the light level. I do not like using torches or spotlights to watch wildlife at night. All one can then see is what is in the beam, we are blind to anything beyond the white. With two weeks of moon larger than a quarter, there are plenty of nights for good watching. I used the flash here to see what prey the adults were bringing in. With flash I can grab an image and identify the prey species later at the desk. And there is no need to use full flash either. I do not like images of nocturnal animals like up like Christmas trees in bright artificial-coloured flash. I like to photograph what I see - softly flying birds in soft light, silent as ghosts (apart from the chicks' spooky low growling).

Mum with two of the kids under a full moon

Saturday, 8 November 2014

White-browed Scrubwren nest

A pair of White-browed Scrubwrens Sericornis frontalis, male behind
A pair of White-browed Scrubwrens nested successfully in our garden this spring and I took a look at the nest once the young had fledged. Two chicks were reared from three eggs, the third did not hatch, as often happens with birds. So all was well and the birds are all still foraging about the garden three weeks later.

The domed nest in situ, hidden at the base of a clump of irises
The birds took over a week to build the nest, the female doing all the work while the male escorted her as she collected material from the garden. She would only go into the nest once there was no danger of predators watching her. Yet she must have made the journey thousands of times.

The nest laid on top of a hat to show the scale of the nest
The nest was large and oval, about the size of a hat crown, with a side entrance well hidden from above by an overhang of grasses. The nest was predominantly made of grasses, including bamboo leaves, and most of the outside was covered with lawn-cuttings mixed with leaves. It looked just like a clump of leaf litter lying in the garden.

The dark interior of the nest betrayed by a single Eastern Rosella feather.  The nest had a well-defined doorstep, seen here laid out to the left of the entrance, and a pronounced overhang above the door which was opened up by the fledglings on the last day when they sat at the door before fledging
Once the outer covering was removed the internal dome could be clearly seen as a separate tightly-knit dome of finer grasses. This was the true nest-chamber, and it felt warm when a finger was placed inside to check the contents.

The inner dome is seen here with the cryptic covering laid open
When opened up, the inner dome was found to be densely lined with feathers and the single unhatched egg
lay there, pale against the dark background. These feathers were wrapped all around the inside of the dome, not only in the nest cup.

The inside of the inner dome was lined with feathers and held a single unhatched egg. The feathers seem pale in the sunlight, but in the complete shaded nest they were dark.
The feathers of the lining were well-flattened into a mat by the large nestlings trampling on them - they were in the nest for two weeks. This and the feather scales in the nest were a sign that the brood had likely fledged successfully.

The fine white feather scales on the nest lining are an indication that the nest held well-grown chicks - for this is the shreds of feather sheaths cast off as the young birds' feathers developed
I then pulled the nest further apart and counted the feathers used in the lining. There 230 feathers; 7 (3%) from Red Wattlebird, 25 (11%) from our backyard chickens, 33 (14%) from Eastern Rosella, 34 (15%) from Crested Pigeon, and the majority 131 (57%) from Australian Magpie. (This might seem like a lot of feathers, but in Europe, the Long-tailed Tit can add 2500 feathers to its nest lining).

Most (222, 97%) of the feathers were dark (dark grey or black) or had a dark base, as with those of the Rosella and Pigeon feathers which were otherwise light-coloured. The few white feathers (8, 3%) were from chickens. Yet there were four white chickens in the flock and only one black, and magpies have light feathers as well as dark ones, so why did the Scrubwrens use so many dark feathers and so few light ones? It might be that the dark background aids the Scrubwrens to see the contrast of their pale eggs and or the light yellow of their nestlings' gapes. Or it might help the adult birds distinguish any cuckoo eggs or young and evict them early. I shall study this further.

All the feathers from the lining laid out