Hi all -- We went out onto our deck at about 6:00 pm, to look at the gathering storm clouds, when we noticed that a number of nighthawks were aloft, flying roughly N to S -- in less than a minute about 25 flew over, some quite low. With them were a number of swifts and a few swallows. There was a brief hiatus, then another group came over -- this time over 100 birds in about 10 minutes, again accompanied by swifts. Some were about 75 feet up, some mere specks in the sky. Probably more passed by, since they were flying over before we came out onto the deck, and we also do not have a complete view of the sky due to trees. Did anyone else observe this flight? We live in Colesville, near the intersection of Randolph and NH Ave. Gail Mackiernan