First frogmouths now on eggs

A few pairs of Tawny Frogmouths are now incubating their first eggs of the year. The earliest eggs in Canberra were probably laid over last weekend, about the 27th August. This is a little early, the earliest I have seen birds on eggs has been the 12th August several years ago. Most will probably lay in early-mid September which is not much different from the usual dates. Some birds began building their nests over a month ago, possibly in response to the high rainfall in the area during the past few months over winter. However, after a warm spell, there has been some colder weather and this might have halted any early developments. This bird is unusually easy to see as his tail breaks the outline of the branches. Their tails usually lie along the nest branch. (It is the male that incubates during the day, while both sexes take turns at night).

When seen along the nest branch, a predator's view, the bird is less noticeable. Its grey plumage blends well with the colour of the tree's branches.

This nest is quite large and substantially raised up above the branch. This causes the bird's tail to lie high above the branch and hence, reveal the bird's presence.

Meanwhile, the females roost by day, relying on their camouflage for concealment from potential predators. Spots and flecks blend with spots and flecks.

Buff-rumped Thornbill nest

A well hidden thornbill nest

The woods are busy with the sound of nesting birds at the moment. Some building, carrying material, some scolding in alarm as we pass by and others make almost constant contact calls between one another as they gather food for chicks. Chicks which lie still in hidden nests, but can blow their cover by emitting urgent begging calls as they see or hear their parents approach with food.

This nest is of a pair of Buff-rumped Thornbills  Acanthiza reguloides. It is a neatly crafted ball of bark strips and grasses locked together with spider webs and egg cases, then lined with what looked like a mix of small feathers, kangaroo hair and plant down. Set in a crack behind some flaking bark on an old Yellow Box tree it was invisible from most angles, except from that from where the side entrance could be discerned as a tell-tale round hole in an otherwise linear pattern of bark. 

I heard the adult birds first, calling to one another, then they gave alarm as I approached their nest tree. I could see they were carrying food; a large moth in the first case, the other something very small, so I walked back a few paces and watched the birds sneak into their nest to feed their chicks (3). They quickly set off for another foraging trip, and I knew I had about two minutes before they returned. So I unzipped the camera as I approached the tree, found the nest straight away, took a few shots, and walked away before the birds returned. Minimal disturbance, means minimal risk of predation by ravens or currawongs.

Small birds only need small niches to nest in - some very small

Tawny Frogmouths breeding

The first tawny Frogmouths are now incubating eggs.So the field season is now on for me until at least Christmas. That means lots of walking through the woods, checking locations where there have been frogmouths nesting in previous years and always looking out for more in new places.

A male frogmouth sits on his nest, as all males do during the day.

His female sits quietly all day in a nearby tree, they will share the 

incubation during the night, never leaving the eggs unattended.

Lyrebirds

Yesterday, I was surveying lyrebirds up in the Brindabella Mountains behind Canberra. This was done by listening for and mapping singing males. I have been doing this since 2000, before the big fire which burnt out most of their habitat of leaflitter-rich ground cover beneath tall forest canopy. And as an aside I check a few places where I have known the birds to build their nests in the past. One such site is on rocks at the head of a gully, and I soon found a new nest from this year, set a few metres up on a cliff.

Their nests are large stick-built affairs about a metre in height and width, within which there is a tight spherical cavity lined with roots. And in the base of that the female lays her single egg in a bed of down and feathers.I expected to find an egg hidden in the down (the female was nowhere near the nest as they habitually leave eggs and young for long periods of the day) but was surprised to find a chick. In previous years I have found recently laid eggs at this date. So this was an early breeding attempt. 

The chick was lying quietly in the warm nest and would be easily overlooked by a predator. It was only as I looked closely that it raised its head and squawked at me with a very shrill call, which I am sure would deter many a predator to poke its head into the nest.