The sulphur crested cockatoo is a white bird with a striking erectile yellow crest, and a yellow suffusion on the underside of the wings and tail. Body length ranges from 18-22 inches long. The eye-ring can be pale blue or white, depending on the race. Australian birds show a slight yellowish wash on the ear-coverts. The bill is blackish, as are the feet. Median life expectancy is 40 years in the wild.