Their cheek skin changes color based on their health or level of stress so when highly stressed the skin will change color to a pink/beige, while when highly excited the skin changes to yellow. Their legs are grey/black with few feathers on their thighs and their red facial markings are their most distinguished characteristic. Their strong mandibles are used for cracking nuts and are larger in males than in females. This partly open mouth makes it easier for the birds to hold nuts in their mouth and crack them at the same time. Their beaks never close completely, always revealing a bit of their black-tipped red tongues. Palm cockatoos are almost all black with a 15 cm erectile crest on their head. Wing length is around 35.1 cm, tail length 23.8 cm, bill length 9.1 cm, and tarsus length averages 3.5 cm. They weigh 500 to 1100 g, with females ranging from 500 to 950 g and males ranging from 540 to 1100 g. Palm cockatoos are the largest of all parrots, ranging from 49 to 68 cm in height. ( "Fact Sheets: Palm Cockatoo", 2006 "Palm Cockatoo", 2006 "Parrots: Cockatoos", 2006) During the day they roost near food or water sources and at night roost in or near a nest tree. They choose large trees for nesting and roosting. Palm cockatoos are found in rainforests, including gallery forests, forest edges, monsoon woodlands, eucalypt and paperbark woodlands, partly cleared areas, and dense savannas. stenolopus, in New Guinea and Western Irian. goliath, the largest of the subspecies, found in Western Irian and the Papuan Islands, and finally P. atterimus, found in the Misool Isles, Aru Islands, and Northern Australia, P. Palm cockatoos are found in the Australasian region, including New Guinea, the Cape York Peninsula (Northern Australia), Aru Islands, West Irian, Misool Isle (Western Papuan Islands) and other islands.
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