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Giraffes have elastic blood vessels in their necks, this makes it possible for them to drink water from a pond, without fainting. A giraffe's heart has the formidable task of pumping blood at high enough pressure so that it can flow up the giraffe's neck to the brain. To accomplish this, a giraffe's heart is specially adapted; it generates twice the blood pressure of other large mammals. Having enough blood pressure to pump blood to the brain when the giraffe's neck is extended upward is one...
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