| http://www.w3.org/ns/prov#value | - Although polar bears (Ursus maritimus) and brown bears (Ursus arctos) differ greatly physiologically and behaviorally, a new study shows that the female ancestor of all living polar bears was a brown bear that lived in the vicinity of present-day Britain and Ireland just prior to the peak of the last ice age -- 20,000 to 50,000 years ago.
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