Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
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Sloths take two weeks to digest their food.
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A koi fish, named "Hanako", was owned by several individuals over many years and lived to be 226 years old, dying in 1977.
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A 42-foot sperm whale has about 7 tons of oil in it.
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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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