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

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Recommended Citation

Lauro, Anthony J. and Spencer, Barbara J. (1980) "A Method for Separating Juvenal and First-winter Ring-billed Gulls (larus Delawarensis) and Common Gulls (larus Canus)," American Birds: Vol. 34 : Iss. 2 , Article 1.
Available at: https://digitalcommons.usf.edu/american_birds/vol34/iss2/1