BirdAnalyst
Family · Laridae · Charadriiformes

Gulls, Terns & Skimmers Population Trends

25 species tracked, ordered by long-term trend. Steepest declines first.

Gulls, Terns & Skimmers species ranked by population trend.
TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
Common TernWetland birds-98%1968
Heermann's GullWetland birds-97%1981
Western GullWetland birds-89%1970
Least TernWetland birds-88%1968
Roseate TernWetland birds-85%1972
Black SkimmerWetland birds-85%1968
Bonaparte's GullWetland birds-81%1982
Herring GullWetland birds-77%1968
Royal TernWetland birds-75%1968
Aleutian TernWetland birds-69%1985
Black TernWetland birds-51%1968
Laughing GullWetland birds-42%1968
Glaucous GullWetland birds-34%1986
Great Black-backed GullWetland birds-1%1968
Caspian TernWetland birds+61%1968
Gull-billed TernWetland birds+75%1968
Glaucous-winged GullWetland birds+112%1970
Forster's TernWetland birds+114%1968
Ring-billed GullWetland birds+167%1968
Franklin's GullWetland birds+217%1969
California GullWetland birds+284%1970
Black-legged KittiwakeWetland birds+332%1982
Sandwich TernWetland birds+476%1979
Short-billed GullWetland birds+673%1976
Arctic TernWetland birds+694%1977