This is a worm. It's called a planarian. It's about an inch long, and you'll find it gliding along the bottoms of rivers and ponds all over the world. It has a hidden talent that has made it famous. It can regrow its body parts better than almost any other animal on Earth.
So if by some chance something bites its head off or removes its tail, or zaps its head and its tail simultaneously, the dangling middle piece will, within a couple of weeks, grow both its front and its back to full size. Meanwhile, the severed head, if left alone, will also generate a full-sized new worm. The lonesome tail will do that, too, so where you started with one worm, you'll now have three.
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