The smoky-black or grey Palm Cockatoo (Probosciger aterrimus) is the world's largest cockatoo – an adult male can measure more than two feet. It also has the second largest bill of any parrot – only the Hyacinth Macaw has a larger bill. The bill is unusual as the upper and lower mandible do not touch until a certain length, meaning it can use its tongue to hold a nut in place to crack it open. Also known as the goliath cockatoo or great black cockatoo, it is known for its distinctive red cheek patches that blush when excited or alarmed. Palm Cockatoos are thought to be the only bird species to use tools for musical expression – the male breaks off and drums thick sticks on tree hollows to attract mates. It is native to the rain forests of New Guinea, the Aru Islands, and Cape York Peninsula in Queensland, Australia. It prefers forested areas, including dense savannas and woodlands, and relies on large, old trees with hollows for nesting and roosting.
