From Science's Online Daily News Site

摘要

Digging in the frozen tundra of Norway's Sval-bard archipelago, scientists have uncovered the remains of the most ancient polar bear ever found. DNA analyses reveal that the bear-a mature male-lived about 120,000 years ago, at a time when wooly mammoths were also roaming the land. The work also shows that this bear represents something very rare in thernfossil record: an evolutionary snapshot of one species turning into another.