House's entire bird collection – including a large number of yellow-crested cockatoos – hours before surrendering Hong Kong to Japanese troops in December 1941. Historians and conservation biologists in Hong Kong have found no evidence to corroborate this story, and believe that Hong Kong's yellow-crested cockatoo population is made up of escaped pets. The earliest record of an escaped pet yellow-crested cockatoo comes from 1959. References External links ARKive - images and movies of the yellow-crested cockatoo (Cacatua sulphurea) mytoos.com - information on cockatoos in captivity BirdLife Species Factsheet Red Data Book yellow-crested cockatoo Feral parrots Birds of Sulawesi Birds of the Lesser Sunda Islands yellow-crested cockatoo yellow-crested cockatoo