Polar Bear DNA Study Shows Split From Brown Bears Earlier Than Previously Thought

Polar bears have been chilling on the ice far longer than is generally thought, new research suggests, and they probably interbred with brown bears at one point after the two species separated. The new German study contradicts data from a study published last July in the journal Current Biology that suggested polar bears separated from brown bears150,000 years ago. The new study analyzed the bears' mitochondrial DNA, a special "additional genome" that lives in the cell's energy factories and is passed down only from the mother. The new study concludes that the bears became separate species closer to 600,000 years ago.

http://tinyurl.com/6ltz2a4

Polar Bears are Irish

An international team of scientists has discovered 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.

http://tinyurl.com/3vctzpr