Sulphur-crested Cockatoos Colouration

To: Jack Shapiro <>
Subject: Sulphur-crested Cockatoos Colouration
From: John Gamblin <>
Date: Mon, 27 Oct 2003 17:46:57 -0800 (PST)
Diet change ....

---  wrote:
> Hi All,
> Here's a list of replies i got to my initial posting...i'm still
> unconvinced about this colouration:
> Sender                                     Sighting Location
> Suggested
> Cause
> Peter Fuller(myself)                           Fyansford, Geelong,
>                                 Wanted to stand out in a crowd
> Jill Dark
> Cairns/Atherton
> Tablelands,QLD                               Feeding on Red Soil
> Philip Veerman                                   No sighting
> Wood
> pulp from nest excavating ( educated guess)
> John Reidy                                           Leeton, NSW
>   Bathing in puddle of very muddy red water (visibly muddy)
> Duncan Fraser                                    Gippsland, VIC
> ??????????????????
> Annabel Ashworth/Hoskins            Tamworth, NSW
> Molasses
> from farmers feed supplement blocks turning feathers pink.
> Alan Gillanders                          Atherton Tablelands, QLD
> Staining from red, tropical soils.
> Jack Shapiro                              Mosman, NSW
> Heres some images of the bird i saw down at Fyansford:
> Please let me know if you have troubles accessing this link.
> Cheers,
> Peter
> On Thursday  ( 23/10/03) while walking at Balmoral Beach (Mosman,
> NSW), I
> observed a group of 4 Sulphur-crested Cockatoos feeding on grass
> roots on
> the lawn.  One of them was had a light brown colouration to most of
> it
> feathers except the head.  In bright sunlight it looked brown, but
> perhaps
> under lesser bright conditions it may be viewed as "pinkish".  The
> bird
> itself looked exactly like the other cockatoos in its features, not
> like a
> hybrid.  I have seen hybrid of Sulphur-crested Cockatoos and Galahs,
> and
> this was not one of them. The bird didn¹t look dirty, but at the
> interface
> between the coloured and white regions of the plumage , the
> colouration
> didn¹t look natural.  This may well be an example of what Peter
> Fuller
> suggested a phenomenon related to nesting.
> Recently there has been correspondence on this type of observation in
> birding Aus, with Peter Fuller initiating the subject (Peter Fuller ;
> [BIRDING-AUS] Sulphur-crested Cockatoos colouration- 27, 28,29 August
> 2003).
> What is curious is that such colouration has only been reported this
> year,
> and on other  different individuals of this species, at very diverse
> locations.  Could the dry weather this year be responsible in so
> indirect
> way ?
> Jack Shapiro

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