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.

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

The oceans of the Cretaceous of North America teemed with life. Gigantic fish and enormous marine reptiles hunted the Western Interior Sea. A unique new fossil demonstrates rare evidence of direct ...