Why Can a House Lizard Grow a New Tafl After the Old One Breaks Off?

Sometimes, a house lizard will break off its tail and run away from small animals which bully it. The small catch only the tail of the lizard. Why can a house lizard grow a new tail soon after the old one breaks off?

House lizard has a strong capability of regeneration of the tail. Therefore, a new tail can grow several days after the old one breaks off. However, this new tail is a little bit shorter than the original one. Breaking off its tail to save its life is a special ability by house lizard.