Another Brutal Fact About the Ice Age Arctic: The Hyenas

Since the first hyena fossil was identified in the Americas nearly a century ago, scientists have suspected that an extinct species of hyena, Chasmaporthetes ossifragus, must have traveled over the Bering Land Bridge from Siberia. Tseng knows a hyena tooth when he sees one, and he immediately picked up on the triple cusps and pyramidal shape of the third premolar.