“If a snake’s body get severed, it can re-attach it’s body (the severed head and tail would find each other) – and live(!) – as long as the sun is not down, because, according to these people, a snake dies only after the sun sets and then it can not re-attach itself.”  Reptiles do not regenerate limbs. However, some amphibians do: lizards, frogs, salamanders.  If you cut a snakes head off – it’s DEAD! However please read above #5.5 on Dead snakes that can bite.