In 2003, the U.S. Fish and Wildlife Service (Service) implemented the first of five nationwide monitoring efforts for American Peregrine Falcons (Falco peregrinus anatum) (Peregrine Falcons) as described in the Service's post-delisting monitoring plan (USFWS 2003). More than 300 observers monitored 438 Peregrine Falcon territories across six monitoring regions. Monitoring in the Southwestern monitoring region fell short of the monitoring goal, where 36 of the targeted 96 territories were monitored; efforts are underway to implement full-scale monitoring in that region in 2006.