eos D5 mark ll, 500mm f/4L. F/5.6 at 1/320, of a second, ISo 1250. Hand held as I didn't have time to get a tripod.
While out teaching my son to drive on a remote county road I yelled STOP!!! as I tried to see where a rapid patch of fur disappeared into the woods. After reassuring my son nothing was the matter I found the Pine Marten.