Yellow Crested Cockatoo (Cacatua Sulphurea) : Critical. Its precipitous decline is almost entirely attributable to unsustainable exploitation for internal and international trade. Large-scale logging and conversion of forest to agriculture across its range has exacerbated the decline, and the use of pesticides since around 1989 is a further potential threat. Juvenile Komodo Dragons Varanus komodensis pose a threat to nestlings on Komodo. Competition for cavity nest sites with other parrots and owls in large trees (those targeted by logging activities) leads to low productivity. On the smaller islands of Roti, Alor and Pantar, enforcement of hunting and trading regulations is low. (IUCN Red List).