According to the San Diego Zoo, Hippos are considered "the most dangerous of all mammals," even if they appear cute. They can be extremely territorial and respond aggressively when threatened.

Meet Lucy's hunter, a massive, horned crocodile that likely terrorized early human ancestors in ancient Ethiopia.

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While most wild animals avoid humans, a small number of species are responsible for the majority of fatal attacks each year. Some are predators by nature, while others bite or kill out of defense, ...