/sarcasm off
Just looking up predators on mammoths on Google, I found an interesting thing. Apparently, there was a report in Siberia in 1918 of a hunter seeing a wooly mammoth. Sounds far-fetched, but Siberia's very large, and was very sparsely populated in 1918. I suppose it could have happened.
These days, it's unlikely that any such isolated mammoth could still survive, given our satellite mapping. But...you just never know. They've only been extinct, supposedly, for a few thousand years now.
Wouldn't that be a treat?