Post by Admin on Sept 19, 2013 12:26:40 GMT
The Bear Almanac - Second Edition:
The early polar bear. Very few fossil remains of polar bears have been found, but it is known that ancestors of present-day polar bear moved into the arctic during the Pleistocene Epoch. Koch explains, "... it is accepted that during the age of glaciers, perhaps during the mid-Pleistocene, a sizable group of brown bears was isolated from the main population. During this isolation, strong selection pressures forced them to change their style of life." Tyrannus was markedly larger and more "arctos-like" than present-day polar bear.
The early polar bear. Very few fossil remains of polar bears have been found, but it is known that ancestors of present-day polar bear moved into the arctic during the Pleistocene Epoch. Koch explains, "... it is accepted that during the age of glaciers, perhaps during the mid-Pleistocene, a sizable group of brown bears was isolated from the main population. During this isolation, strong selection pressures forced them to change their style of life." Tyrannus was markedly larger and more "arctos-like" than present-day polar bear.