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Why do giraffes have such long necks?

If an alien arrived on Earth today and asked you to describe all of the world's animals, which do you think it would be most surprised by? Perhaps the millipede, with its dozens of tiny legs? Or the platypus, with its mysterious duck-bill? What about the enormous neck of the giraffe? This video from PBS Eons explains how the giraffe got such a fantastically long neck.

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