Here's an example of how nature is totally MESSED UP. Some guy in Alabama posted a video to Facebook of a copperhead snake he'd just decapitated with a machete. And not only is the body still moving, but so is the HEAD.

And when the body gets too close...the head BITES IT.

It happens at :27. Apparently it came near his kid, and copperhead bites are poisonous...although not as dangerous as people think.  WARNING: Mutilated snake!