On 4 June 1978, we found a dead, adult Barn Swallow (Hirundo rustica) hanging from a twisted loop of horsehair suspended from an empty, adherent Barn Swallow nest beneath a secondary highway bridge in Franklin County, Washington. The 10-meter-long wooden bridge, situated 1 meter over an irrigation canal in a farmland area, contained 45 active Barn Swallow nests. The looped horsehair, incorporated into the nest rim, was twisted several times around the swallow's neck, causing death by strangulation. Of the 45 active swallow nests on the bridge, 43 had eggs (mean = 3.8) while 2 contained young (mean = 3.0).