Its a woolly mammoth?

[Mike41793]

It doesn't really look like a bear to me. So I'm going to go with CGI.
If it was really a mammoth it be weird that it was alone, mammoths traveled in packs. Wouldn't there have been more then one?

Yea i was kinda thinking this too. As far as elephants females and the young stay together and i think the males roam in a pack together too. So ya seeing it alone would be kinda odd.