Attributes / relations provided by
♦ ¹Robert Gwiazda, Dariusz Bukaciński, Grzegorz Neubauer, Marcin Faber, Jacek Betleja, Magdalena Zagalska-Neubauer, Monika Bukacińska & Przemysław Chylarecki, Diet composition of the Caspian Gull (Larus cachinnans) in inland Poland: effects of breeding area, breeding stage and sympatric breeding with the Herring Gull (Larus argentatus), Ornis Fennica 88:80–89. 2011
♦ ²Reproductive parameters in relation to food supply in the whiskered tern (Chlidonias hybrida), Jean-Marc Paillisson, Sébastien Reeber, Alexandre Carpentier, Loïc Marion, J Ornithol (2007) 148:69–77