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Photo Gallery: Snakes

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While some snakes spend the winter gathered in dens, they disperse widely the rest of the year, making it difficult to find food or mates. To survive, snakes have evolved the forked tongue. They use it to collect scent molecules, which they process within special organs, to discern whether they are nearing a food item or a deadly foe. Male snakes can also judge whether a female snake is of the same species, how ready she is to mate, and—from the intensity of the scents on each fork—in which direction she moving. Photograph by Tim Laman