Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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Leonardo Da Vinci loved animals so much that he used to buy caged animals at the market just to set them free.
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The colossal squid has the largest eyes in the world.
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A giraffe's kick is so powerful that it can decapitate a lion.
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Baks the blind boxer has a seeing eye goose named Buttons; a four-year-old goose who leads the pup around everywhere either by hanging onto him with her neck, or by honking to tell him which way to go.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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