Fossil On the cave bear (Ursus spelaeus), a relative from the brown bear and polar bear through the Pleistocene epoch in Europe The subfamily Ursinae seasoned a spectacular proliferation of taxa about 5.three–four.5 Mya, coincident with main environmental modifications; the primary associates in the genus Ursus appeared about this time. https://www.youtube.com/channel/UCCoZfLHRsYsRsVHqS-CSAWA