The amount and variety of wildlife living in cities is really quite extraordinary. Yesterday I went for a long walk down by the South Platte River and not more than 200 meters from the still operating power plant there there two kingfishers calling at each other. As there are no trees on that stretch of the river one of them was using a wire strung across the river as a perch to call and hunt from. I only recently learned what the "rattle" call of the belted kingfisher sounds like and now I am hearing and seeing them every time I go near water.