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 their tongues out to show anger.
Horses rub noses as a sign of affection. Kangaroos thump their hind legs to warn others of danger. Prairie dogs bare their teeth and press their mouths together to discover if they are friends or foes. Swans entwine their long necks both to fight and to court.