The authors conducted a long-term project (1992-1996)designed to provide a comprehensive review of vertebrates (amphibians, reptiles, birds, and mammals) in four national parks in the eastern United States. The focus of this report is birds.

The National Park Service determined the need for in-depth inventorying of bird and mammal populations at Fort Necessity National Battlefield (FONE) and Friendship Hill National Historic Site (FRHI) in southwestern Pennsylvania. The objectives of the bird and mammal inventory project: (1) obtain comprehensive inventory data on birds and mammals, (2) document occurrence, identify distribution, and estimate relative abundance of birds and mammals, and (3) provide guidance for monitoring birds and mammals at FONE and FRHI.