Ethan Clotfelter (Amherst College Department of Biology) and his students have studied the reproductive behavior of tree swallows in a field near Book & Plow since 2004.  Their early studies focused on how variation in female age and body condition influenced incubation behavior in female swallows. More recently, they have investigated the effects of ectoparasites on the development and fledging success of juvenile swallows, including the use of radio telemetry to track swallows on their migratory routes.  They use Book & Plow as a site to measure the abundance of aerial insects, the primary food of tree swallows, throughout the breeding season.