Mosquitoes don't just bite you, they also pee on you.
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If a vampire bat goes 2 days without drinking blood, they can die. However, well fed female bats will puke up blood and share it with other bats that they like in exchange for grooming.
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Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Jumping fleas can accelerate 50 times faster than the space shuttle.
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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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