birding-aus

Black Cockatoos in flight

To: Sandy Gilmore <>
Subject: Black Cockatoos in flight
From: Peter Shute <>
Date: Sat, 14 Jun 2014 13:40:55 +1000
>From that very interesting paper:
"Airspeed observations were obtained by ornithodolite ..."

I don't know what that is, but I want one.

Peter Shute

Sent from my iPad

> On 13 Jun 2014, at 10:06 am, "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.
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