Sandy Dannis shared this photo of a mink that she encountered while walking on her land in Dalton, New Hampshire. Mink aren't typically found up trees, but they're known to climb when they're startled, as was likely the case here.
So what was this mink up to (other than a tree)? Perhaps it was looking for romance. It's mating season for the animals, and they range widely during this time. Kits will be born in late spring.