Have you ever seen an animal drop off its tail?  Grass snakes and certain other lizards can leave their tails behind to save their lives.  Most lizards have tails longer than their bodies.  If an enemy catches the lizard by the tail, the lizard quickly breaks off its tail, which continues to wiggle for a few minutes.

While the twitching tail holds the attention of the would-be attacker, the lizard makes a safe getaway.  The lizard does not seem to miss its tail, and it soon grows a new one to replace it.  But the new tail is never as long as the original one.– Dick Rogers