Palm cockatoo (Probosciger aterrimus)
The cockatoo is a large (49 cm to 68 cm in length, 500-1100 grams in weight) predominantly black bird with a spectacular backward-curving erectile crest. The massive upper mandible is considerably larger in males than in females. The black-tipped red tongue remains visible through much of the length of the unique bill, which meets only at the tip. The cockatoo has powder down, which dulls their glossy beak and adds a gray colour to their black plumage. The legs are gray-black and have somewhat sparsely feathered thighs. Their red, naked facial markings are their most distinctive characteristic. The colour of the facial patches can range from off white to burgundy and its intensity may vary according to the individual's stress level or general health.
Palm cockatoos emit a wide variety of vocalizations, displays and other behaviors that enable them to maintain contact and communicate effectively with one another in their heavily forested habitat. These vocalizations include a variety of cries, whistles, grunts and screeches. They will also stomp noisily on a perch and use a stick or nut to drum loudly on a hollow log.