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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.

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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.

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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.

Human Eye Diagram Human Eye Diagram
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Estimated times of divergence of human and Neanderthal genomic Estimated times of divergence of human and Neanderthal genomic
Video: Diversity of Living Creatures - Charles Darwin & the Beagle's Voyage

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