I am not sure if this counts or not as "backcountry" but here goes.
I was in Nicaragua for a month, living on an the island Ometepe in a village of a few hundred locals at a plantation that also run a small and wonderful hostel that had about 10-20 backpackers and travelers in it at any given time. I went on hikes through the jungle nearly everyday, and it was amazing. One day walking through the village I passed a hut, and could not help but look inside, as there was a lot of motion that caught my eye.
And now I can say that I got to see a little person (like, 3 feet tall), with a pot on her head, and brandishing a large wooden spoon to drive a large pig out of the hut.
But on a backpacking trip on a trail out in the woods type backcountry? Out in the middle nowhere near the board to Norway, I found a moose leg. There was no other parts of the moose, just the leg. I was bushwacking, and just following animal trails, so my best guess is that a bear killed the moose, and in the process removed a leg. Then the bear dragged the rest of the body away (to its den?) to eat.