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-97%1968
Heermann's GullWetland birds-97%1981
Least TernWetland birds-90%1968
Western GullWetland birds-86%1970
Roseate TernWetland birds-85%1972
Black SkimmerWetland birds-82%1968
Aleutian TernWetland birds-81%1985
Herring GullWetland birds-70%1968
Royal TernWetland birds-70%1968
Black TernWetland birds-44%1968
Bonaparte's GullWetland birds-34%1982
Glaucous GullWetland birds-21%1986
Laughing GullWetland birds-20%1968
Great Black-backed GullWetland birds-5%1968
Caspian TernWetland birds+81%1968
Glaucous-winged GullWetland birds+100%1970
Gull-billed TernWetland birds+101%1968
Forster's TernWetland birds+105%1968
Sandwich TernWetland birds+123%1979
Ring-billed GullWetland birds+155%1968
Franklin's GullWetland birds+222%1969
California GullWetland birds+360%1970
Arctic TernWetland birds+556%1977
Black-legged KittiwakeWetland birds+572%1982
Short-billed GullWetland birds+655%1976