How do animals communicate?

How do polar bears show they are happy. (move their body fast/move their head from side to side)

A bear growls when it is happy, angry or both?

How do some frogs communicate? (change colour/hiss)

How do some frogs and spiders send messages to each other?

How do snakes and crocodiles show they're angry? (Hiss/Growl)

How do chimpanzees say Hello?

How do birds communicate?

What do cats do when they like each other?

How do elephants show they are angry? (move very fast/move their tail)