World's Weirdest

Sea slug orgies; hermaphrodite flatworms; fish that walk on land and lizards that walk on water— dive in with the World's Weirdest underwater creatures. Flounders have a migrating eye that moves to one side of their face, enabling them to lie flat on one side for hunting. And a mimicking octopus not only changes colors but can emulate anything from rocks to snakes.

Some creatures are so bizarre they defy imagination. Komodo dragons use a sixth sense — a smell-o-vision from the roof of their mouth to seek out prey, and cannibal black widow spiders sense movement with their feet. The female preying mantis bites off her mate's head during sex, while the horned lizard shoots blood out of its eyes in self-defense. And hedgehogs will munch on cigarettes and bathe in oil in order to be crossed off the menu for predators.

The sky isn't just for the birds — some of the world's strangest animals don't need wings for takeoff. Flying squirrels are more like paper airplanes, with built-in evolutionary parachutes. Asian carp spring from the water at velocities known to knock people out and break noses. Certain snakes don't just slither, they fly, gliding across the canopies as they transform their bodies to create lift. And meet a real vampire — a bat that won't last two days without drinking blood.