On the road from the north to Old Faithful and ran into these majestic creatures blocking the road way but only for a bit.
The path from mammoth hot springs and Gardner was amazing. we saw so many animals and wild life. not to mention the scenic views of Yellowstone.
I would recommend doing a winter trip to Yellowstone.
only downsidw is you have to take a snow coach into the park and their limited on times. so plan ahead.