birding-aus

Swifts at sunset.

To: Sandy Gilmore <>, "" <>
Subject: Swifts at sunset.
From: Chris Corben <>
Date: Fri, 13 Jun 2014 06:32:38 -0500
Hey Sandy!

Ever seen the swifts roosting? Or suspected you might be in a place where that happens?

Some of us witnessed this many years ago near Brisbane - a lone bird flying repeatedly past a particular point at dusk ended up landing and roosting in a cluster of foliage near the top of the tree. Apparently this is normal behaviour for this species, but rarely seen.

Cheers, Chris.



On 06/12/2014 07:02 PM, Sandy Gilmore wrote:
Hi everone,

A very timely question since I frequently get Yellow-tailed Black Cockatoos 
flying over and infrequently get Glossy Cockatoos flying over.

While enjoying the sunset a few days back I had both species fly over a few 
minutes apart and it was abundantly obvious that Glossy Cockatoos flap their 
wings at twice or more the rate of Yellow-tailed Black Cockatoos.

This is in the situation where I presume both were returning to their night 
time roosts and were flying high over a mixture of forest and cleared paddocks.

Aerodynamics experts would be able to explain this inter-specific difference 
based substantially on their relative body weights, and wing areas and wing 
spans.

See http://jeb.biologists.org/content/150/1/171.full.pdf

On another matter I have increased my White-throated Needletail  sightings over 
summer by an order of magnitude, plus observing other interesting birds, by 
taking time to observe the sunset as often as possible.

Cheers,

Sandy



Sandy Gilmore
Arid Zone Ecologist

Bush Heritage Australia
"Morinda" 240 Mafeking Road, Goonengerry NSW 2482.

Conservation Support Centre
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--

Chris Corben.


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