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.