birding-aus

Black Cockatoos in flight

To: martin cachard <>, Philip Veerman <>, "" <>
Subject: Black Cockatoos in flight
From: <>
Date: Fri, 13 Jun 2014 20:52:07 +0000
Thanks everyone for taking the time to answer my question.


Regards,
Mark



Sent from Surface Pro





From: martin cachard
Sent: ‎Friday‎, ‎13‎ ‎June‎ ‎2014 ‎14‎:‎03
To: Philip Veerman, 





that's right Philip, I wouldn't either...
the markedly slower flight & deeper wing-beats of Yellow-taileds when compared 
to Glossy, or even Red-taileds, is rather obvious when u see both species 
fairly often, as Sandy has pointed out earlier.
it actually is a good field character for discerning Yellow-taileds from 
Glossy, but the flight patterns of Red-taileds & Glossy would be too close to 
call with any accuracy I would say...
I would assume that WA Carnaby's would be similar to Yellow-taileds given their 
close relationship, but I've not seen Baudin's often enough myself, without 
checking the books first.
as for Baudin's...I don't know...???
 
cheers
martin cachard,
cairns 
 
 
> From: 
> To: 
> Date: Fri, 13 Jun 2014 13:37:44 +1000
> Subject: Re: [Birding-Aus] Black Cockatoos in flight
> 
> Forshaw's Australian Parrots book describes Glossy Black Cockatoo as:
> extremely buoyant flight with having slow, shallow wing beats, which differ
> markedly from the full flapping wing beats of the ..... YTBC............ So
> a different suggestion. 
> 
> Neither does directly mean that speed of flight is different. If it does it
> would not suggest that Glossy Black Cockatoo is the slower one, which was
> the question posed by Mark. I wouldn't use slow flight as a feature to
> identify a Glossy Black Cockatoo cf YTBC. 
> 
> Philip  
> 
> -----Original Message-----
> From: Birding-Aus  On Behalf Of
> Sandy Gilmore
> Sent: Friday, 13 June 2014 10:03 AM
> To: 
> Subject: Re: [Birding-Aus] Black Cockatoos in flight
> 
> 
> 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
> Level 5, 395 Collins Street, Melbourne Vic 3000
> www.bushheritage.org.au<http://www.bushheritage.org.au/>
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> M: +61(0)427 686 985
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