I am posting a link to a minute long movie that a friend made with her digital camera. The Swifts are flying into a chimney of a building her grandfather owns in PA. It is the only time I have seen this process and believe you might enjoy it as well.

http://home.comcast.net/~bnbbirdsa/Chimneyswifts.wmv

Robert Meyer
Renton, WA
Mailto bobnbernie at comcast.net