The colossal squid has the largest eyes in the world.
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An alligator can go through 2,000 to 3,000 teeth in a lifetime.
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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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A cat rubs against people not only to be affectionate but also to mark out its territory with scent glands around its face. The tail area and paws also carry the cat's scent.
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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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