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Freaks of the Sky

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.