This marten was likely up at 10,900ft/3300m to hunt pikas, but when I stumbled along it became very curious about me. I was able to snap photos for about 8 minutes, then moved on to photograph the flock of rosy finches that was half dosing off while observing the marten. I wasn't able to observe any predation, but may have heard a couple distant screams.
Trail 21, Jasper Ridge Biological Preserve, a few meters from west end of Searsville Dam. About 7.5 inches long. Photos 3,4 by Alice Cummings