Tortoises have immune systems so robust they can survive injuries that would kill most animals.

Certain birds build hanging nests from woven plant fibers.

Fact #471 · Animals

Bats are the only mammals capable of sustained flight.

Fact #58 · Animals

Some birds migrate between hemispheres each year.

Fact #203 · Animals

Some species of bats use echolocation to hunt in darkness.

Fact #390 · Animals

Penguins can drink salt water because of specialized glands.

Fact #362 · Animals

Certain species of octopus are known to use coconut shells as shelter.

Fact #410 · Animals

Some species of crabs can regenerate lost claws.

Fact #396 · Animals

Some species of snakes give live birth instead of laying eggs.

Fact #540 · Animals