What happens to a lizard if an animal bites its tail off?

Snakes are very agile, intelligent, and coordinated animals. In most cases a snake would not bite itself, even on accident. However, if a snake were to bite itself, perhaps in the process of eating, it would have no adverse effect on the snake. Even if the snake was venomous it would not be hurt by its own bite, because venomous snakes are immune to their own venom. In extremely rare cases, some snakes have been known to ingest their tails, but there is not a known cause for this behavior and, as I said, it is extremely rare.