Jose B. Ruiz / Audouin's gull {Larua audouinii} Columbretes Islands, Castellon, Spain

Juan Manuel Borrero / Audouin's gull {Larua audouinii} with chick, Delta del Ebro National Park, Catalonia, Spain

Juan Manuel Borrero / Audouin's gull newly hatched chick and eggs in nest {Ichthyaetus audouinii} Delta del Ebro NP, Spain Catalonia

Nick Upton / Audouin's gull (Ichthyaetus audouinii / Larus audouinii) scavenging on a beach near sunbathing tourists, Mallorca, Spain, August.

Nick Upton / Audouin's gull (Ichthyaetus audouinii / Larus audouinii) in flight overhead, Mallorca, Spain, August.

Nick Upton / Audouin's gull (Ichthyaetus audouinii / Larus audouinii) drinking seawater on a rocky shore, Mallorca, Spain, August.

Sebastia Torrens/ BIA / Audouin's Gull (Ichthyaetus audouinii) landing, Mallorca, Spain

Mathias Schaef / Audouin's Gull (Ichthyaetus audouinii), Mallorca, Spain

Christine Jung / Audouin's Gull (Ichthyaetus audouinii) first-cycle juvenile, Taqah, Oman

Christine Jung / Audouin's Gull (Ichthyaetus audouinii), Mallorca, Spain

Juan Manuel Borrero / Illustration of Audouin's Gull (Larus audouinii). Near Threatened species. Pencil and watercolor painting.

Mike Read / Audouin's Gull (Ichthyaetus audouinii) adult in flight. Near Barcaggio Cap, Corsica, April.

Nick Upton / Audouin's gull (Ichthyaetus audouinii) hovering low over the sea. Near Ajaccio, Corsica, France, May.

Nick Upton / Audouin's gull (Ichthyaetus audouinii) alighting on sea surface. Near Ajaccio, Corsica, France, May.

Nick Upton / Immature Audouin's gull (Ichthyaetus audouinii) flying low over the sea. Near Ajaccio, Corsica, France, May.

Francis Abbott / Audouin's Gull (Ichthyaetus audouinii) nest with hatchling and one egg, Isla del Aire, Menorca. Endangered.

Francis Abbott / Audouin's Gull (Ichthyaetus audouinii) nest with two eggs, Isla del Aire, Menorca. Endangered

Inaki Relanzon / Audouin's Gull (Ichthyaetus audouinii), Menorca, Balearic Islands, Spain

Inaki Relanzon / Audouin's Gull (Ichthyaetus audouinii) pair, one calling, Menorca, Balearic Islands, Spain

Juan Manuel Borrero / Audouin's Gull {Ichthyaetus audouinii} Delta del Ebro NP, Catalonia, Spain

Juan Manuel Borrero / Audouin's gull (Ichthyaetus audouinii) standing on beach, Delta del Ebro NP, Spain

Juan Manuel Borrero / Adult Audouin's gull (Ichthyaetus audouinii) walking with chick beneath, Delta del Ebro NP, Spain

Jose B. Ruiz / Audouin's gull (Ichthyaetus audouinii) panting while sitting on nest, thermoregulation behaviour, Columbretes Islands, Spain

Jose B. Ruiz / Audouin's gull on nest {Ichthyaetus audouinii} Columbretes Is, Spain, Europe

Jose B. Ruiz / Audouin's gull feeding on fish {Ichthyaetus audouinii} Spain

Jose B. Ruiz / Audouin's gull {Ichthyaetus audouinii} Spain

Robin Chittenden / Audouin's gull (Ichthyaetus audouinii) on rock calling, Menorca, Spain, May

Robin Chittenden / Audouin's gull (Ichthyaetus audouinii) in flight, Menorca, Spain, May

Jose Luis GOMEZ de FRANCISCO / Audouin's gull (Ichthyaetus audouinii) on beach sand, Tarifa, Spain, September

Jose Luis GOMEZ de FRANCISCO / Audouin's gull (Ichthyaetus audouinii), Santa Pola Natural Park, Alicante, Spain, August

Roger Powell / Immature Audouin's gull (Larus audouinii) in flight. Platja del Trabucador, Ebro Delta, Catalonia, Spain. April.

Roger Powell / Adult Audouin's gull (Larus audouinii) resting on beach. Platja del Trabucador, Ebro Delta, Catalonia, Spain. April.

David Perpinan / Audouin's gull (Larus audouinii) chick in nest, panting due to summer temperatures, Tarragona, Spain, June.

David Perpinan / Audouin's gull (Larus audouinii) chick ringing procedure, Tarragona, Spain, June.

David Perpinan / Audouin's gull (Larus audouinii) chick ringing procedure, Tarragona, Spain, June.

David Perpinan / Group of Audouin's gull (Larus audouinii) in a breeding colony, Tarragona, Spain, June.

David Perpinan / Audouin's gull (Larus audouinii), chick held during bird ringing, Tarragona, Spain, June.

David Perpinan / Audouin's gull (Larus audouinii), Chick on its nest, Alert behaviour resting flat and immobile while researchers ring chicks of a nearby nest, Tarratgona, Spain, June.

Roger Powell / Audouin's gull (Larus audouinii) male display calling over its breeding territory. Ebro Delta marismas , Catalonia, Spain, May.

Roger Powell / Audouin's gull (Larus audouinii) in flight. Ebro Delta marismas , Catalonia, Spain, April.