American Mink

When I saw something brown dart along the river shore for a moment I wasn't sure what it was. No one else noticed it, and a warbler was flying by overhead so I looked away and photographed the bird and when I looked back this mink was gone. An hour or so later when we walked by the area, we saw it again a bit up the path! Not long after the second photo was taken, it slid into a hole and vanished!
Wikipedia