Erika and I came upon this mature Bald Eagle in the Cannon Falls city park on 2 April 2011. The eagle flew up over Lake Fredrickson where it empties into the Cannon River. The eagle perched atop a one of the large cottonwoods over the park. The bird preceded to preen and fluff out its feathers. Although no prey items were apparent, eagles often preen after feeding. We don't visit the city park all that often, but this eagle observation is our second in several years of a bird perched in the cottonwoods.