From Wikipedia -
" The Mexican mole lizard ( Bipes biporus ), commonly known as the five-toed worm lizard , or simply as Bipes , is a species of amphisbaenian, which is endemic to the Baja California Peninsula. It is one of four species of amphisbaenians that have legs. It is commonly found in Baja California.
" Like all other amphisbaenians, this burrowing species only surfaces at night or after heavy rain. It uses its autotomous tail as an escape tactic for predators. Losing a part of the tail while burrowing can plug up the hole behind it, giving it time to escape."