Our largest gull. Primarily a bird of the Atlantic Coast, seldom seen inland except around the Great Lakes. Because of its large size and omnivorous feeding habits, the Great Black-back can be a ...

Juvenile and first-winter herrings are extremely ... linked to egging and competition with expanding great black-backed gull populations.

This is the common and familiar “sea­gull ... black subterminal ring. Winter adult: head and neck with fine dusky streaking and spotting. Slightly duller bill and legs; dark orbital ring ...

Once a rare stray to North America, this European gull has become a very common visitor here. Thousands are found every winter (with smaller numbers at other seasons), mainly along the Atlantic Coast ...

The Yellow-legged Gull has only recently been recognised ... the head is less streaked and whiter than Herring Gulls. Juvenile Yellow-legged Gulls are very similar to juvenile Lesser Black-backed ...