The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function, she must be able to see another pigeon.
65
A spider's silk is stronger than steel.
52
Flamingos can only eat with their heads upside down.
38
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Woodpecker scalps, porpoise teeth and giraffe tails have all been used as money.
46
Minnows have teeth in their throat.
21
Starfish don't have brains.
132
Flies are deaf.
379