(Some herring x glaucous-winged hybrids very like Thayer’s ... linked to egging and competition with expanding great black-backed gull populations.

Medium-size, 3-cycle gull with sloping head, medium-size bill. On adult, note yellow legs, pale eyes, and neat “ring bill.” Breeding adult: pale gray upperparts; black wing tip with white ...

The picture of a gull I took on Dún Laoghaire’s Eblana ... This is because its wings are grey and have black wing tips with white spots. When the wings are folded, the black tips with the ...