BirdAnalyst
Species · Kansas · BBS 2025 Release · 1966–2024

Forster's Tern Population Trend in Kansas

All statesWetland birds

Forster's Tern in Kansas has fallen sharply: down 58% on the route-weighted index since 1969.

-58%Since 1969
3Routes In State
34Years

Notable Forster's Tern Trends in Kansas

long arc declinecomputed index

Forster's Tern has fallen sharply in Kansas: down 58% on the route-weighted index since 1969.

Forster's Tern Population Forecast in Kansas

If the recent trend holds, Forster's Tern in Kansas is projected to stay roughly flat through 2024, near 0.12 (95% range 0.00–0.66). A 5-year backtest shows a typical error of ±283.2%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2024
0.12Projected 2024 index
0.00–0.6695% range
±283.2%Backtest error
19672024
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20200.130.000.67
20210.130.000.66
20220.130.000.66
20230.130.000.66
20240.120.000.66

Forster's Tern Survey Routes in Kansas

Routes recording Forster's Tern in Kansas.
Logan1020012001
Albert120191967
Missler119891989

Forster's Tern Population Trend in Other States

alabamacaliforniacoloradodelawarefloridageorgiaidahoillinoisindianaiowalouisianamarylandmichiganminnesotamontananebraskanevadanew-jerseynew-yorknorth-carolinanorth-dakotaoregonsouth-carolinasouth-dakotatexasutahvirginiawashingtonwisconsinwyoming

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.