I once saw a stoat at the summit cairn of Derry Cairngorm, it romped about a bit and entered the cairn itself, hiding in the crevices between rocks. I've also seen toads and frogs at high altitude, in some very steep places, up on the slopes of Carn an Tuirc near the Glen Shee ski areas. We are not the only mountaineers, though I didn't see any little ice axes...