Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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Dire wolves actually existed, living up to 10,000 years ago before going extinct.
10
The largest breed of rabbit is the Flemish Giant.
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The first known contraceptive was crocodile dung, used by Egyptians in 2000 B.C.
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When cats are happy, they may squeeze their eyes shut.
10
Penguins have a gland above their eye that turns saltwater into freshwater.
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