• [Wiki] http://en.wikipedia.org/wiki/Creagrus_furcatus.
• [avibase] https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=07357A2592045462&sec=lifehistory.
• [Harr1970] Harris, M. P. (1970). Breeding ecology of the swallow-tailed gull, Creagrus furcatus. The Auk, 87(2):215--243.
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