Assertion: cockatoo's bird | /r/IsA | parrot
Facets:
Source sentences:
text: For example, to be classified as a parrot, the bird must have a curved beak, and its feet must be zygodactyl, which means there are four toes on each foot with two toes that point forward and two that point backward.
text: To be classified as a parrot, a bird must have a curved beak.