The first test-tube baby, Louise Brown, was born in 1978 — IVF has since helped create over 10 million babies.

Some fish can change color to blend with their surroundings.

Fact #392 · Animals

A hedgehog rolls into a spiny ball when threatened.

Fact #555 · Animals

Certain birds store food in hidden caches.

Fact #426 · Animals

Certain frogs can glide from tree to tree.

Fact #394 · Animals

Many species of beetles have hardened wing covers called elytra.

Fact #457 · Animals

Certain fish live in symbiotic relationships with other species.

Fact #535 · Animals

A hummingbird can hover in place while feeding.

Fact #484 · Animals

Some spiders can glide through the air using silk.

Fact #369 · Animals