Nature's Ninja

Ninja were skilled warriors in medieval Japan. And now you can find ninja in comics, movies, and TV shows. But what about in nature? Real animals aren''t anything like ninja . . . are they?A stealthy lizard that can climb walls and hang upside down by its toes? Yes! A sea creature that defends itself with weapons that look a whole lot like throwing stars? Definitely! An insect that blends in so we...