The yellow-crested cockatoo also known as the lesser sulphur-crested cockatoo, is a medium-sized cockatoo with white plumage, bluish-white bare orbital skin, grey feet, a black bill, and a retractile yellow or orange crest. The sexes are similar. Source: Wikipedia
Cacatua sulphurea sulphurea: Sulawesi and offlying islands Muna and Butung; now very rare
Cacatua sulphurea djampeana: islands in the Flores Sea: Tanahjampea Islands (Kayuadi, Tanahjampea, Kalao, Kalaotoa and Madu) and Tukangbesi Islands (Wangiwangi, Tomea and Binongko)
Cacatua sulphurea abbotti: Masalembu Besar I. (Java Sea); critically endangered
Cacatua sulphurea parvula: central Lesser Sundas (Roti, Semau, and Timor)
Cacatua sulphurea occidentalis: western and central Lesser Sundas (Lombok, Sumbawa, Komodo, Padar, Rinca, Flores, Pantar and Alor); probably extirpated on Lombok, and critically rare on Sumbawa and Flores