Possible spoiler's so you may not want to read this....
Well it seems the Bears are a Sibling species, and not Children of the Wolves, and they must be really good allies since it appears Amicus shared the data download COM took from Earth's nexus (internet). Amicus was pretty clear he wanted the location of Earth (or even it's name) kept from others.
Based on Bjarni's looks, and the fact that all the Sibling races did uplift on Earth and then abandoned Earth, I'd say the Bears were involved with the Vikings based somewhat with the clothes and the various braids in his hair. It will be interesting to see what we further learn from him and about his people as the story advances.