The immortal jellyfish (Turritopsis dohrnii) can revert to its juvenile state after reaching adulthood.

A flamingo’s pink color comes from its diet.

Water is the only common substance on Earth that naturally exists in all three states — solid, liquid, and gas — at everyday temperatures.

The oldest known living tree sprouted before the Egyptian pyramids were built.

A bolt of lightning is about one inch wide but can be miles long.

The penguin’s dense feathers create a waterproof barrier.

A gecko can climb vertical surfaces using microscopic hairs on its feet.

Tyrannosaurus rex had teeth that could grow over 12 inches long.

A sea turtle can navigate using Earth's magnetic field.