Some geckos, skinks, and salamanders have the ability to sacrifice their tails in order to save their lives. During an attack, the tails of these reptiles and amphibians can detach -- and then continue wriggling, presumably from stored energy along the spinal column, creating a diversion that allows the prey to flee. This self-defense mechanism is called autotomy, or self-amputation.
The animal can partially regenerate its tail, usually over a period of weeks, but the new appendage is usually a different length, texture, or color from the original.
Take it, I can grow another:
Very true. My dogs grab salamanders and usually end up with their tails while they make a getaway. Most of them around my house have stubs for tails now!