It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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Cyanide works by making the human body unable to use oxygen.
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The average adult has about 21 square feet of skin.