Several years ago, a pair of American Kestrels occupied a nest box in one of the prairies at Fair Meadows, and I had the opportunity to observe social interactions of their newly fledged young.
Yellow-crowned Night Herons are spotted regularly during migration in southern Wisconsin, and may even breed rarely in the state, with a few reports in the Wisconsin Breeding Bird Atlas.
Cuckoos are secretive, so spotting them and making an identification only by their bill color is difficult. Both can be found in the same habitats which adds some complication to ID, but there are a couple other good ways to tell them apart.