I have spent much of my life along the Pere Marquette River and have seen many deer swimming in the river. At this moment I am experiencing a first: a deer has decided to leap in the river and cross directly in front of our drift boat. At automobile speeds, our vessel would have hit it. Deer swim fast so at river current speed our boat left the deer time to safely cross and join its mother on the opposite bank. F3.5 at 1/800, ISO 400, 80-200mm lens at 135mm