How does the parrot's foot configuration differ from most perching birds?

Answer

Parrots have two toes forward and two backward, whereas most perching birds are anisodactyl (three forward, one back).

Most perching birds possess anisodactyl feet (three forward, one back), but the parrot's zygodactyl arrangement of two forward and two backward toes allows for an exceptionally secure grip.

How does the parrot's foot configuration differ from most perching birds?
birdanatomyphysical characteristicParrot