Sloths are so slow that algae grow on them — forming a symbiotic ecosystem that hosts moths and beetles.

Some fish use tools to crack open shellfish.

Fact #405 · Animals

Some species of bats use echolocation to hunt in darkness.

Fact #390 · Animals

A tarantula can survive for weeks without food.

Fact #353 · Animals

Archaeopteryx is considered a transitional fossil between dinosaurs and birds.

Fact #624 · Animals

Some butterflies use mimicry to avoid predators.

Fact #556 · Animals

Certain fish clean parasites off larger fish.

Fact #523 · Animals

Some plants respond to changes in light and touch.

Fact #95 · Animals

Certain frogs can inflate themselves to appear larger to predators.

Fact #377 · Animals