Great Grey owls are cool critters, have seen them a few times.
Many years ago while mule deer hunting looked up the hill and saw a Bighorn ram about 50 yards away, probably 30 miles as the crow flies from his normal hang out. Later that same day I had shot a little buck. As I was gutting him the grey jays collected and were very vocal calling in all their buddies. All of a sudden there was quite the commotion in the spruce tree beside me and a Sharp-shinned hawk practically fell out of the tree with one of said grey jays in his talons, barely clearing the ground with a bird more than half his size he flew off. The rest of the jays squawking loudly chased him off in the distance. Eerily quiet from then on, no jays came back for the duration of my work.
The highlight of rare was the wolverine my buddy and I saw on the Utah/Idaho border 4 years ago. We were learning the country the day before the hunt started and saw that a Red-tailed Hawk was pestering some critter out in the sage flat a few hundred yards from the road. Figured out it was a wolverine, went to get a closer look while it was loping from bush to bush looking for lunch oblivious to us. Finally at about 30 yards he noticed us behind him, he turned, arched his back and growled. Close enough, he stared us down and then turned and loped off.
The next year in Idaho while packing out my cow, which was relatively close to the road and I was busy packing out my other partners cow that was a longer pack, he got to the quarters and noticed that one of the bags had been torn open and meat was consumed. On his return trip he found the perpetrator, a Pine Marten, chewing on another quarter. He ended up feeding the Marten a piece of meat on the end of a stick and the Marten stayed while he loaded up another quarter. Those were his Caribou meat sacks that the Marten had torn open. Pretty cool encounter and he didn't have his phone with him.