The Triassic period followed the Permian extinction.

Some mammals, like bats, use echolocation.

Fact #465 · Animals

Some snakes can sense heat using specialized pits.

Fact #408 · Animals

Some species of jellyfish are biologically immortal under certain conditions.

Fact #159 · Animals

A crocodile’s teeth are replaced throughout its lifetime.

Fact #532 · Animals

Some birds build elaborate nests.

Fact #308 · Animals

Some insects glow through bioluminescence.

Fact #529 · Animals

Many species of beetles have hardened wing covers called elytra.

Fact #457 · Animals

Certain birds can recognize themselves in mirrors.

Fact #404 · Animals