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The giraffe can't yawn
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It the only terrestrial vertebrate who doesn't have this faculty. The giraffe, emblematic mammal of the African savannah, cannot yawn. The main hypothesis put forward to explain this inaptitude is the absence of biological rhythm in the giraffe. The latter has a very choppy sleep and sleeps on average only two hours a day!
Photo credit: Ben Thouard / The Explorers
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