Migratory locusts change form, color, and behavior when population density rises — a rare polymorphism.

Blue whales can grow longer than 90 feet.

Fact #341 · Animals

Dolphins use echolocation to navigate and hunt underwater.

Fact #12 · Animals

A tiger’s stripes are unique like human fingerprints.

Fact #468 · Animals

Polar bears have black skin beneath their white fur.

Fact #26 · Animals

Some species of sharks must keep moving to breathe.

Fact #284 · Animals

Some birds can sleep while flying.

Fact #332 · Animals

A sea lion can hold its breath for several minutes underwater.

Fact #400 · Animals

An ostrich's eye is larger than its brain.

Fact #349 · Animals