A method for separating juvenal and first-winter Ring-billed Gulls (Larus delawarensis) and Common Gulls (Larus canus)

Authors
Anthony J. Lauro, Barbara J. Spencer
Journal
American Birds
Volume
34
Issue
2 (March)
Year
1980
Pages
111-117
File attachments
p00111-p00117.pdf (907.68 KB)

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