Peg: The beheading of Tree Swallows and bluebirds is uncommon but predictable in areas frequented by House Sparrows. I do not know of any other avian predator other than HOSP's that behead songbirds in nest boxes. We found a bluebird hen in her nest box yesterday, beheaded by a HOSP. Kent Hall Stevens Point in Portage Co. ----- Original Message ----- From: Peg Zappen To: Wisbirdn Sent: Friday, May 08, 2009 7:00 AM Subject: [wisb] tree swallow in blue bird nest A friend of mine, newly interested in birds, found a beheaded tree swallow in her nest box. The nest box is appropriately baffled. Any insight on how this may have happened? Thanks for your help. Peg Zappen Trempealeau