A new study led by researchers at the University of California, Santa Cruz, suggests that dietary flexibility may have been an important factor giving wolves and bears an edge over saber-toothed cats and cave lions.
Black bears have a remarkable capacity to heal their wounds as they hibernate - with almost no scarring and infections.
Experts have predicted more deadly encounter between Yellowstone`s hungry bears and humans this fall.
Day in Pics: 26th November
Showbiz World - November 26, 2014