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Caspian Terns (Hydroprogne caspia) Fledge a Ring-billed Gul..:

Oswald, Stephen A. ; Wails, Christy N. ; Morey, Brittany E..
Waterbirds: The International Journal of Waterbird Biology.  36 (2013)  3 - p. 385-389 , 2013
Link: http://www.jstor.org/stable/24641546