Fossil On the cave bear (Ursus spelaeus), a relative from the brown bear and polar bear in the Pleistocene epoch in Europe The subfamily Ursinae experienced a spectacular proliferation of taxa about 5.3–four.5 Mya, coincident with significant environmental improvements; the first users from the genus Ursus appeared around this time. https://www.youtube.com/channel/UCCoZfLHRsYsRsVHqS-CSAWA