The Eastern Bluebirds and the Tree Swallows were really going at it to secure the nesting boxes that are scattered about the park. Quite a few are along one stretch of the main open area. A lot of activity, but they were all over the place so with the camera & lens I was using I did not get any of the action shots. I was using the Canon R with the 150-600mm Tamron lens with a Sigma 2X Teleconverter for a focal length of 1200mm. Here are a series of images of the Tree Swallows around some of the nesting boxes.