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A fake spider at the tip of this snake's tail helps it lure birds: Scientists get their first look inside it

Lots of animals use mimicry to survive. Some copy the appearance of threatening predators, and others have evolved to resemble plants or rocks so they can blend into the background and avoid being attacked. But a viper from Iran has found an even stranger strategy. The tip of this snake's tail looks like a spider, complete with a bulbous body and long dangling legs. And when a bird swoops in to try to eat this "spider," the snake springs into action and eats the bird.

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