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White cockatoos are more commonly found in captivity than black cockatoos.
Illegal trade in wild-caught birds contributes to the decline of some cockatoo species in the wild.
Cockatoos are recognisable by the showy crests and curved bills.
The plumage of males and females is similar in most species.
The plumage of the female cockatiel is duller than the male, but the most marked sexual dimorphism occurs in the gang-gang cockatoo and the two species of black cockatoos in the subgenus Calyptorhynchus, namely the red-tailed and glossy black cockatoos.
The iris colour differs in a few species, being pink or red in the female galah and Major Mitchell's cockatoo and red-brown in some other female white cockatoo species. Cockatoos maintain their plumage with frequent preening throughout the day.
They remove dirt and oil and realign feather barbs by nibbling their feathers.