A REVIEW OF BEAR EVOLUTION BRUCE MCLELLAN, Forest Sciences Research Branch, Revelstoke Forest District, RPO#3, Box 9158, Revelstoke, BC VOE 3KO DAVID C. REINER, U.S. The polar bear has evolved over time from the common brown bear by changing its fur colour to white, the ideal colour to blend in with its ice-covered surroundings. The bears form a clade within the Carnivora. Their ancestors evolved into a family of small mammals known as the Miacids (Miacidae).The bears, small bears and also the canines developed from the Miacids. You’re probably aware that nature’s most badass animal is undoubtedly the tiny tardigrade, or water bear. The evolution of bears as we know them today, started around 30 million years ago. How did the polar bear evolve? Follow Tia Ghose on Twitter @tiaghose . Other caniforms are bears, skunks, seals, otters and weasels. That makes it difficult to trace their evolution from a common ancestor with brown bears, she said. Fish and Wildlife Service, NS 312, University of Montana, Missoula, MT Abstract. Follow LiveScience @livescience , … The polar bear is the most recently evolved species and descended from a population of brown bears that became isolated in northern latitudes by glaciation 400,000 years ago. With new data an international research team now documents that the separation from the brown bear … DNA study clarifies how polar bears and brown bears are related Date: March 14, 2013 Source: University of California, Santa Cruz Summary: A new genetic study of polar bears and brown bears … The cladogram is based on molecular phylogeny of six genes in Flynn, 2005. Apr 6, 2008, 00:39 IST Zoologists believe that the polar bear evolved from a species of brown bears in Siberia, making polar bears the eighth species of bears. Older pre-ice-age brown bears, dating to between 43,000 and 38,000 years ago, had a different genetic signature matching that of modern bears from eastern Europe. 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