Zombie Snake Watch the head of this coppersnake bite it's body after being cut off

  A wide range of predatory snakes are capable of reacting to stimuli and lashing out at potential threats for up to an hour after being relieved of the rest of their mortal coils.

In warm-blooded animals, our high metabolisms are a significant disadvantage when being decapitated. Just a few minutes without oxygen and a mammal's brain is caput—the result of a massive cascading cellular die-off. Not so with cold-blooded reptiles.

Their slow metabolism sustains their internal organs for far longer than a mammals causing them to completely die far more slowly. Essentially, cutting off their heads only makes them mostly dead.