I just received a brand-spanking-new 100-400L today, and took it over to the nearby pond to try it out. Most of the pond is still frozen, but there's a very small patch of open water where the lazy mallards congregate in the winter. The energetic mallards have, of course, flown south for the winter. As I approached, this guy got spooked and walked onto the ice to chill. C&C always welcomed.