Humans are the only animals known to cry emotional tears.

Penguins can drink salt water because of specialized glands.

Fact #362 · Animals

Sea otters hold hands while sleeping to avoid drifting apart.

Fact #364 · Animals

A sloth can take up to a month to digest a single meal.

Fact #441 · Animals

An albatross can glide for hours without flapping its wings.

Fact #539 · Animals

The platypus is one of the few mammals that lay eggs.

Fact #382 · Animals

Certain fish change sex during their lifetime.

Fact #503 · Animals

Some insects communicate using pheromones.

Fact #469 · Animals

Some species of ants wage organized territorial battles.

Fact #401 · Animals