I've seen 3 wolverines in the 25+ years I've lived up here and all within the last 15. We ran across one in the Brooks one year while on a caribou float hunt on the Kurupa River, I was fly fishing for grayling when one came running down the bank on the other side of the river, it jumped in the water as I ran to grab my rifle, he took off like a bat out of hell and I never got a shot off. The others I saw down near Delta while I was sheep hunting and they were too far off to pursue.
We've got fishers back home in Maine and they can be pretty fierce if cornered and have a hell of a scream that'll make the hairs on the back of your neck stand up.
