Attributes / relations provided by
♦ 1Activity patterns and foraging behaviour of Audouins gulls in the Ebro Delta, NW Mediterranean, SANTI MAÑOSA, DANIEL ORO and XAVIER RUIZ, SCI. MAR., 68 (4): 605-614 (2004)
♦ 2del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.).
Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.