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
♦ ²Variation in the diet of the viperine snake Natrix maura in relation to prey availability, Xavier Santos, Jacob González-Solís and Gustavo A. Llorente, ECOGRAPHY 23: 185–192. Copenhagen 2000