The hallmark of the Lesser Sulfur Crested Cockatoo is the striking yellow crest which stands proudly atop his head. The crest of this cockatoo is one of the largest and most impressive among all members. When relaxed the crest lies facing back on his head, but when excited or stimulated it rises straight up standing several inches in height. The bright yellow feathers are accented by several white feathers beginning the crest at the front.

Aside from the brilliant yellow crest the rest of the Lesser Sulfur Crested Cockatoo's plumage is white. In addition they have soft yellow cheek patches and yellow can be seen on the underside of the tail and wings. They are smaller than some of the other Cockatoo species measuring in at thirteen inches with a wing length of eight to nine and a half inches. They black bills and dark brown iris. Males and females look identical except the female typically has a smaller bill and a lighter colored iris, which is brown or reddish in color. An immature bird will have a dark iris in for males and females with lighter feet than the normal adult gray.

A Lesser Sulfur Crested Cockatoo is readily trained to learn tricks. They also have exhibited strong mimicking ability, with many owners reporting speech from their Lesser Sulfur Crested Cockatoo. It has a distinct call and can become quite noisy. The Lesser Sulfur Cockatoo has a great love of chewing, and should be provided with a large number of toys to prevent boredom. This bird will feather pluck if bored. Chewing can also result in escape from his cage if an inappropriate cage is purchased.

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