The Greenland shark's flesh is toxic due to trimethylamine oxide — it must be fermented for months before eating.

Butterflies can see ultraviolet patterns on flowers.

Fact #368 · Animals

Some birds build elaborate nests.

Fact #308 · Animals

Some sharks detect electrical signals from other animals.

Fact #128 · Animals

A polar bear's fur is actually transparent.

Fact #391 · Animals

Orcas are highly social animals that live in pods.

Fact #395 · Animals

Some species of ants wage organized territorial battles.

Fact #401 · Animals

Certain species of octopus are known to use coconut shells as shelter.

Fact #410 · Animals

Some butterflies migrate thousands of miles.

Fact #262 · Animals