The smallpox vaccine led to the global eradication of smallpox.

Certain birds build nests on cliffs for protection.

Fact #531 · Animals

Some species of turtles can breathe through their cloaca underwater.

Fact #365 · Animals

Some amphibians undergo dramatic transformations during metamorphosis.

Fact #493 · Animals

Certain frogs are poisonous to predators.

Fact #418 · Animals

A blue whale's tongue can weigh as much as an elephant.

Fact #443 · Animals

Certain ants can survive floods by forming living rafts.

Fact #550 · Animals

Owls can rotate their heads up to about 270 degrees.

Fact #38 · Animals

Some birds sing complex songs to mark territory.

Fact #517 · Animals