Cooperative Fish and Wildlife Research Units Program: Massachusetts
Education, Research and Technical Assistance for Managing Our Natural Resources

Clark, D. E., K. K. G. Koenen, J. W. Pereira, K. G. MacKenzie, and S. DeStefano. 2016. Fidelity and persistence of ring-billed gulls (Larus delawarensis) and herring gulls (Larus argentatus) to wintering sites in Massachusetts. Waterbirds 39:220-234.