Generally speaking, it's always a good idea to keep your distance from wildlife. This is especially true of elk who this time of year are particularly feisty. One big elk in Colorado recently proved that point by challenging all of the vehicles everywhere.
There is always an uneasy peace between bears and wolves in Yellowstone National Park. That was witnessed by guests (and workers) in the park a few days ago as a grizzly and two wolves came face-to-snout in a showdown in Hayden Valley.
In Yellowstone National Park, grizzlies and wolves are two of the fiercest competitors. However, there's a new video share that shows it's not always that way. A huge grizzly and a couple wolves are spotted just kind of hanging out.
It's hard to impress a bison and not necessarily safe to try. You can ask a group of snowmobilers who just recently traversed Yellowstone National Park in a snowstorm. No, the bison they encountered was not impressed.