Yellow-tailed Black Cockatoos are mostly black, with yellow tail panels and a yellow cheek patch. HOWEVER, below is a photo of a leucistic male. A melanin impairment caused the normal black coloration to be yellow.
Relevant Bird Species Information Page (includes more stunning photos of this bird species)
Photographer: Kookr / David Cook Wildlife Photography – http://www.flickr.com/people/ozjulian/
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