From our perch we have a good view of a number of potential roost sites. The trip will be part of a count of Chimney Swifts. Chimney Swift numbers have been falling for a number of years now. This effort is an attempt to get some idea of how many swifts there are in North America. Our findings will be submitted to the official website. The swifts will be migrating then, but they still need chimneys or similar structures to roost in at night. We will be counting (estimating) them as they go diving and swooping into the roost site. These acrobatic little birds are very entertaining to watch, especially when they dive/drop into the roost site. Also, we may well see Common Nighthawks, which should just be starting their evening feeding. The swifts should be in the roost after about an hour or so.