Morphology

The order Psittaciformes consists of three families: Psittacidae, Strigopidae, and Cacatuidae.  Morphologically, all Psittaciformes have zygodactyl feet and strong curved bills. The family Cacatuidae is recognized as the unique family within Psittaciformes because of their crest and lacking the bright blue and green colors in their plumage.

On this Green Wing Macaw you are able to see the zygodactyl feet and strong curved bill.