There's a rare breed of pig that looks like a sheep.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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A tortoise named Adwaita lived to 255 years old. To put it into perspective, he was born before the United States of America existed and his death was announced on CNN (1750-2006).
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Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces it.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Honeypot ants are a unique insect that use their own bodies as living storage pots of honey.
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