Though they look pretty slow, clumsy and friendly, we know hippos aren't necessarily any of those things -- they can run very fast, and according to the African Wildlife Foundation (AWF), they kill nearly 3,000 people every year.
But we never knew they can travel so fast underwater.
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A video published on YouTube Sunday shows a hippo chasing a speedboat during a photo safari in Kasane, Botswana. The hippo follows the boat at an incredible speed, prompting the helmsman to speed up considerably to avoid what seems to be an imminent attack.