Fourth year Yellow-legged Gull (centre), Black Rock, 10th October 2016 (David O'Connor).
Fourth year Yellow-legged Gull (top right, with adult Lesser Black-backed Gull and adult Mediterranean Gull), Black Rock, 10th October 2016 (David O'Connor).
Fourth year Yellow-legged Gull, Black Rock, 10th October 2016 (David O'Connor).
