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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