Halloween Special: Real-Life Zombies Videos

Video 1.26

Halloween Special: Real-Life Zombies

In a spooky coup, a parasitic worm hijacks a snail's brain and makes the snail sacrifice itself to a hungry bird. Carl Zimmer, a contributor to National Geographic's Phenomena science salon and author of the book Parasite Rex, explains how the snail's death helps the parasite perpetuate its sneaky species.

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