The mechanism of tail shedding for survival is determined and inherited by a type of gene; when a predator grabs the tail, the lizard decides to shed its tail! After the tail is separated from the body; the nervous system that controls the movement of the tail is still active; there is still a little blood to nourish the tail muscles, helping the tail to move for a long time! This makes the predator pay attention to the wagging tail, giving the lizard a chance to escape!