BirdAnalyst
Species · BCR 2 · BBS 2025 Release · 1966–2024

Greater Yellowlegs In BCR 2

All regionsBCR 2Shorebirds

Greater Yellowlegs in BCR 2 has risen sharply: up 71% on the route-weighted index since 1986.

+71%Since 1986TrendPercent 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 →
12Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
39YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Greater Yellowlegs has risen sharply in BCR 2: up 71% on the route-weighted index since 1986.

Forecast

If the recent trend holds, Greater Yellowlegs in BCR 2 is projected to stay roughly flat through 2029, near 4.0 (95% range 0.08–8.0). A 5-year backtest shows a typical error of ±125.4%, with 100% of held-out values landing inside the 95% band.

+7%Change by 2029TrendPercent 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 →
4.0Projected 2029 indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →
0.08–8.095% range95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
±125.4%Backtest errorBacktest errorTypical error when we hold out the most recent years, forecast them, and compare to what actually happened. Lower means a more trustworthy projection.Full methodology →
If the recent trend holds, Greater Yellowlegs in BCR 2 is projected to stay roughly flat through 2029, near 4.0 (95% range 0.08–8.0). A 5-year backtest shows a typical error of ±125.4%, with 100% of held-out values landing inside the 95% band.19842029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected indexProjected indexThe central forecast of the abundance index if the recent trend continues. A projection of the current trajectory, not a prediction.Full methodology →95% low95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →95% high95% rangeThe 95% uncertainty band around the projection at the forecast horizon. The true value should land inside it most of the time.Full methodology →
20253.90.007.8
20263.90.007.9
20273.90.007.9
20284.00.047.9
20294.00.088.0

Routes In BCR 2

Routes recording Greater Yellowlegs in BCR 2.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →
Goodnews BayALASKA232005
Togiak RiverALASKA192005
King SalmonALASKA132024
Cold BayALASKA122024
Kanektok RivALASKA82005
DillinghamALASKA62019
Dillingham (Short)ALASKA61984
Katmai N.P.ALASKA52022
Kodiak 2ALASKA52024
ChiniakALASKA42024
KodiakALASKA21984
Gweek RiverALASKA12002

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