Hippopotamuses are known to kill hundreds of people per year. 

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Electric disco clams will flash their predators to confuse them

a close up shot of a murcielago bat

Bats are the Only Mammals Capable of Sustained Flight

Koalas require a lot of sleep because their food gives them very little energy and eucalyptus requires a lot of energy to digest

Black panthers are just leopards or jaguars with excess black pigment

Blue whales are about the length of a tennis court but can grow longer than a basketball court

Squirrels will steal nuts from other squirrels