An oyster can change its sex a number of times during its life.

It takes more calories to eat a piece of celery than the celery has in it to begin with.

A bean has more DNA per cell than a human cell.

A beaver's teeth never stop growing.

A bird requires more food in proportion to its size than a baby or a cat.

A butterfly can look at you through 12,000 eyes.

"Four" is the only number whose number of letters in the name equals the number.

1 kg (2.2 pounds) of lemons contain more sugar than 1 kg of strawberries.

25% of a human's bones are in its feet.

84% of a raw apple is water.

A kangaroo can't jump unless it's tail is touching the ground.

All pyramids were bright white.

An owl cannot move it's eyeballs in its eye sockets.