Polar Bear on the Hudson Bay coast in northern Ontario.
I'm Indigenous and I've gone hunting and trapping with my relatives a few times in my life. On one of those trips we happened on a polar bear on the mud flats of the bay during the late autumn. We drove by in our freighter canoe (a very large oversized canoe with a 60 HP outboard motor) and the bear swam near us and then walked by a few hundred feet away. It wasn't afraid but we were. We watched for a while and then fired rifle shot into the mud next to it to scare it away. From the moment it started to run to the point it disappeared as a speck on the horizon was about a minute or two. I went up later to look at the prints and the clay mud looked like a tractor had driven over it. I couldn't believe how fast it could move on the mud. I quickly sank in my boots and could barely walk around.
One paw print was about the size of my head. I never left camp without someone nearby or a rifle in my hands.