Before a hydra can eat its prey, it has to rip itself apart to form a mouth. Scientists had noticed that its mouth disappears after it eats, but until now they had not seen exactly how the mouth actually forms. See it happen in this eye-opening footage.
Read more about this discovey: http://phenomena.nationalgeographic.com/2016/03/08/this-animal-tears-its-skin-apart-every-time-it-opens-its-mouth/
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Watch: Tiny Hydra Rips Its Mouth Open to Eat | National Geographic
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