Many years ago in 1953, when I was 14, my mom and dad and I took a vacation trip to Yellowstone national park.
My dad was a photography enthusiast and so was I at that time. He prided himself on owning a Leica IIIF 35mm camera, which was pretty much state of the art at that time.
We drove by a meadow, and in that meadow was a lone bull bison. Dad was eager to photograph him, but wanted to get close enough so that he would not come out as just a fly speck on the picture. So he handed me his lightweight aluminum tripod and we both ventured into the meadow.
We got within about 50 yards from the bull, and dad decided that was close enough to get a fair picture.
I dont know if you might be familiar with Leica cameras of that era. They use a focal plane shutter, which is essentially a strip of black fabric with a rectangular hole in it that whips across in front of the film with amazing speed. When it completes its hell-for-leather trip, it terminates with a mechanical "whap" that you can hear from some distance. My dad often said it sounded like somebody dropped a frying pan.
Well, the bull heard it. He turned and looked at us and was not pleased that we had invaded his territory. So he did what bulls do when they perceive to have been challenged - he charged.
Dad and I both took off towards a nearby cluster of trees, reaching them just before the bull did.
I jumped over a fallen log with the tripod in my hands, and managed not to break it. I crouched down and watched my dad get behind a small tree.
For the next 5 minutes or so, my dad and the bull had a standoff, both edging around the tree that was between them. I just tried to be as quite as a mouse.
Well, we were both lucky. The bull lost interest in the contest, and went on his way back to the meadow.
We both remembered that incident for years, and told the story of our misadventure often. It was an interesting father-son bonding experience for sure.
I don't recommend disturbing these animals - from personal experience!
John