Dolphins communicate with each other by clicking, whistling and other sounds.

Elephants have no natural predators. However, lions will sometimes prey on young or weak elephants in the wild. The main risk to elephants is from humans through poaching and changes to their habitat.

The trickiest tongue twister in the English language is apparently "Sixth sick sheik's sixth sheep's sick". Give it a try and see for yourself.

AMAZING FACTS