The hindmost part of an animal, prolonged beyond the rest of the body, like the flexible extension of the backbone.

The hard protective outer case of a mollusk or crustacean

A small, thin plate protecting the skin of fish and reptiles; typically overlapping one another.

A hard, permanent outgrowth, often curved and pointed, found in pairs on a head.

A modified forelimb used for flying.

An animal’s foot with pads and claws.

The horny part of a foot of an ungulate animal (horses, cows, goats, satyrs, etc.)

A claw; such as the toe on a bird of prey’s foot.

Flat appendages growing from the skin and forming plumage.

 The organ responsible for hearing and balance in vertebrates, often located on the head.