Cymothoa exigua is a type of parasite that enters through fish's gills, eats their tongue, and then replaces 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.
13
The cat brain weighs about 30g.
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Cats sleep for 70% of their lives.
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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.
6
Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
On some poorly researched trivia lists it is stated as a fact that a pregnant goldfish is called a twit. This is not true as goldfish lay eggs.
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