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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?

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

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.