Bears of the Pleistocene

[Polar]

The South American version seems to be more robust in bone diameter/bone length ratios than the North American version. Is there any study relating to the enhanced running abilities of Arctodus simus over Arctotherium angustidens? In a documentary (about the extinct North American short-faced bear), I heard the narrator state that A. simus is relatively taller than A. angustidens at the same length, and that A. simus has relatively more muscular endurance than A. angustidens, allowing it to run horses down with ease. Reply