Alligator claws.

Alligator

Alligator claws.

(Archeopteryx macrocrura), an ancient bird fossil showing claws.

Fossil

(Archeopteryx macrocrura), an ancient bird fossil showing claws.

Golden eagle claws.

Golden Eagle

Golden eagle claws.

Claws of a great gray kangaroo.

Kangaroo

Claws of a great gray kangaroo.

Macaw claws.

Macaw

Macaw claws.

The claws of a seal's left hind foot.

Seal

The claws of a seal's left hind foot.

The claws of a skylark.

Skylark

The claws of a skylark.

Water monitor claws.

Water Monitor

Water monitor claws.

Wolf claws.

Wolf

Wolf claws.