Arriving at the nesting sites between late March and early April, Audouin's gull forms colonies from a few pairs to several thousand pairs. Each pair faithfully returns to the same breeding colony each year, but different nesting sites are used depending on the success of the previous year's clutch. Between late April and early May the female lays two to three eggs (9) and incubates them for three weeks (2). The chicks fledge in mid July, when both adults and young leave the colony for the wintering grounds (2). Audouin's gull feeds along the coast, taking mostly fish, including waste from the fishing industry, and cephalopods. It will also consume small mammals, arthropods, small birds and plant material (9).