Cockatoo (family Cacatuidae), any of the 21 species of crested parrots (order Psittaciformes) found in Australia as well as in New Guinea and the Solomon Islands. Most are white with touches of red or yellow; some are black. All have a massive scimitar-like beak for cracking nuts, digging up roots, or prying grubs from wood; feeding is aided by a strong tongue. Cockatoos are treetop, hole-nesting birds; at times they form large, noisy flocks. Because they are showy, inventive, and affectionate, many are caged as pets. Some live more than 50 years.