Separated from the main populations of brown bears, which remained further south, this ancestral population adapted to the cold climate (fur on the feet, white coat for camouflage during hunting, etc.), evolving into Ursus maritimus , whilst the more southerly populations retained the original characters.
(brown bears; remained; further south) (this ancestral population; adapted; to the cold climate) (this ancestral population; evolving; into Ursus maritimus) (the more southerly populations; retained; the original characters)
brown bears this ancestral population this ancestral population the more southerly populations
remained adapted evolving retained
further south
to the cold climate
into Ursus maritimus
the original characters