At around dusk at the 1919 Building at Sells Middle School in Dublin, a swirl of Chimney Swifts builds around a chimney. As darkness falls (around 8 PM), hundreds of Swifts join in, screeching and tumbling, and a few start dropping into the structure for the night. Within a half hour, only a few stragglers are still flying. Darlene Sillick has been a regular visitor to this Sells site, counting the swirl of birds. She has an article about Chimney Swifts in the September/October 2008 issue of Columbus Audubon's "Song Sparrow" newsletter, and on the Columbus Audubon web site at http://www.columbusaudubon.org/chimney_swift_article.html.