Chimpanzees greet each other by touching hands.
Male fiddler crabs wave their giant claw to attract female fiddler crabs.
White-tailed deer show alarm by flicking up their tails.
Dogs stretch their front legs out in front of them and lower their bodies when they want to play.
Elephants show affection by entwining their trunks.
Giraffes press their necks together when they are attracted to each other.
Gorillas stick out their tongues to show anger.