Hi Dave,
The switch from yellow to orange pigmentation can also be due to diet
(beta-carotenes).
Nikolas
A/Prof Nikolas Haass | Head, Experimental Melanoma Therapy Group
The University of Queensland Diamantina Institute
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On 16/07/14 7:06 AM, "Dave Torr" <> wrote:
>A friend of mine has pictures of a what appears to be a Sulphur-crested
>Cockatoo with an orange crest, taken at Eynesbury (west of Melbourne). She
>is interested to know if this is likely to be a natural mutation or
>whether
>it has been deliberately bred that way and then escaped?
>I can supply a photo if anyone wants to see
>Dave
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