With typical gull colouring of black, white and grey, Audouin's gull's most distinctive features are its scarlet red bill and dark eye. The head and body are white, the wings are grey, and the tail is black. In flight black wedges are revealed on the forewing, aiding identification. This gull species looks similar to the yellow-legged gull (Larus michahellis
), but greyish-black legs distinguish Audouin's gull. Juveniles have a brown head that fades to white with age (7).