Environmentalists are raising concern with the declining population of the Yellow-crested Cockatoo.

Also, the Yellow-crested Cockatoo's crest is a brighter color, closer to orange.

An exception is the Yellow-crested Cockatoo, a member of a primarily Australasian family.

The Yellow-crested Cockatoo nests in tree cavities.

The Yellow-crested Cockatoo is critically endangered.

The Yellow-crested Cockatoo is nearing extinction on Sumbawa island.

The Yellow-crested Cockatoo's diet consists mainly of seeds, buds, fruits, nuts and herbaceous plants.

These include the Orange-footed Scrubfowl, the Yellow-crested Cockatoo and the Noisy Friarbird.

ARKive - images and movies of the Yellow-crested Cockatoo (Cacatua sulphurea)

The smallest of the Yellow-crested Cockatoo subspecies, it is endemic to Sumba in the Lesser Sunda Islands in Indonesia.

Collaroy/Narrabeen is frequented by diverse bird and aquatic animal life including Sea Eagles, Pelicans, Terns, Ducks, Yellow-crested Cockatoo.

Yellow-crested Cockatoos, Zoothera thrushes, Hill Mynas, Green Junglefowl and Rainbow Lorikeets are hunted for the cagebird trade by the local people.

The Yellow-crested Cockatoo is found in wooded and cultivated areas of East Timor and Indonesia's islands of Sulawesi and the Lesser Sundas.

Some of the rare birds protected by this park are the critically endangered Yellow-crested Cockatoo, the endemic Timor Green-pigeon, the endangered Timor Imperial-pigeon, and the vulnerable Timor Sparrow.

These are Sumba Yellow-crested Cockatoo, Sumba Green Pigeon, Sumba Flycatcher, Sumba Cicadabird, Apricot-breasted Sunbird and Sumba Hornbill.

An often repeated story is that Hong Kong Governor Sir Mark Aitchison Young released the Government House's entire bird collection - including a large number of Yellow-crested Cockatoos - hours before surrendering Hong Kong to Japanese troops in December 1941.

Lesser Sulphur-Crested Cockatoo (Cacatua sulphurea)