Human laughter may trace its evolutionary beginnings to vocalizations made during play. This type of "laughing" is found in many mammals and even in some birds.

A poll, of 2,000 adults in the UK, found 22 per cent can't help but giggle when a bird poos on someone’s head.

Dog is pranked by a dancing gorilla in a funny skit.

WATCHING people trip over, mischievous pranks, and funny animal videos top the list of things guaranteed to make someone ...