One of the best things that can happen to a zoo or aquarium is for one of their resident animals to go viral. But what happens when these cute animals become, well, less cute?

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Instead, scientists often use the animal’s distinct calls—which sound like a crying newborn baby, the likely source of their name—to differentiate between closely related species.

Watch this unsettling video of an aggressive hippo with incredible speed chasing after a boat full of nervous tourists!