Yellow-crested cockatoo  (Cacatua sulphurea)

The yellow-crested cockatoo is generally white in colour with, as the English name suggests, a crest of yellow feathers on the head that curves forwards (2). The undersides of the wings and tail are also yellow, the bill is black, and the feet are grey. The sexes differ in eye colour; in females they are reddish-brown but males have black eyes. In both sexes the skin around the eye is bluish. Juveniles are similar in appearance to adults but have a grey iris (2), and chicks have patchy yellow down (2). Four subspecies exist; C. s. sulphurea, C. s. abbotti, C. s. parvula, and C. s. citrinocristata (2).