Sloths descend from their tree once a week to defecate — a risky behavior that kills many from predation.

Some marine mammals communicate through clicks and whistles.

Fact #525 · Animals

Some birds can mimic human speech.

Fact #268 · Animals

Some species of ants can form bridges using their bodies.

Fact #420 · Animals

A leopard's rosette spots help camouflage it in forests.

Fact #423 · Animals

A woodpecker's skull absorbs shock from repeated pecking.

Fact #393 · Animals

A sea turtle's gender is influenced by incubation temperature.

Fact #379 · Animals

A bald eagle builds some of the largest nests of any bird.

Fact #553 · Animals

A hummingbird's heart can beat over 1,000 times per minute.

Fact #345 · Animals