Scientists found the 22 million-year-old fossils of a giant carnivore they call "Simbakubwa" sitting in a museum drawer in Kenya. The 3,000-pound predator, a hyaenodont, was many times larger than the modern lions it resembles, and among the largest mammalian predators ever to walk Earth's surface.

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Scientists found the 22 million-year-old fossils of a giant carnivore they call "Simbakubwa" sitting in a museum drawer in Kenya. The 3,000-pound predator, a hyaenodont, was many times larger than the modern lions it resembles, and among the largest mammalian predators ever to walk Earth's surface.