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The sensitive tissue of both claws and hooves is the

Which external bones of the cranium form the lateral walls of the cranium?

The point of the hock is actually the

The pelvic girdle is made up of the

What type of feathers are the flight feathers of the wings and tail?

The three veins most often used for venipuncture in birds are the

Which adaptation to the skeletal system is key to the ability of birds to fly?

The forearm of the wing is formed by the

Heterophils in avian blood are equivalent to __ in mammalian blood.

How many air sacs make up the avian respiratory system?