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Species · Illinois · BBS 2025 Release · 1966–2024

Tufted Titmouse Population Trend in Illinois

All statesForest birds

Tufted Titmouse in Illinois has surged: up 154% on the route-weighted index since 1968.

+154%Since 1968TrendPercent 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 →
100Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
58YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Tufted Titmouse Trends in IllinoisNotable 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 →

Tufted Titmouse has surged in Illinois: up 154% on the route-weighted index since 1968.

Tufted Titmouse Population Forecast in Illinois

If the recent trend holds, Tufted Titmouse in Illinois is projected to fall about 13% by 2029 — from 8.2 in 2024 to a central estimate of 7.1 (95% range 4.9–9.3). A 5-year backtest shows a typical error of ±26.7%, with 60% of held-out values landing inside the 95% band.

-13%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 →
7.1Projected 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 →
4.9–9.395% 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 →
±26.7%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, Tufted Titmouse in Illinois is projected to fall about 13% by 2029 — from 8.2 in 2024 to a central estimate of 7.1 (95% range 4.9–9.3). A 5-year backtest shows a typical error of ±26.7%, with 60% of held-out values landing inside the 95% band.19662029
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 →
20256.94.79.1
20266.94.79.2
20277.04.89.2
20287.14.99.3
20297.14.99.3

Tufted Titmouse Survey Routes in Illinois

Routes recording Tufted Titmouse in Illinois.
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 →
Mt Vernon4920241971
Bremen4320241969
Beaverdam Lk3320231970
Pulaski3120241970
Belknap3120241970
York2920241993
Mascoutah Lk2820241967
Belleview2620241966
Kell2520242001
Cave In Rock2420241993
Bradbury2320241971
Eubanks2320242001
Royalton2320242001
Sandusky2120231993
Marshall2120242003
Pawnee1920241967
Athens1920241995
Delwood1720241970
Dudleyville1620242001
Birds1520241976
St Morgan1220221967
Brownville1220241993
Payson1220242000
Robinson1120231970
Bartonville1020241973

Tufted Titmouse Population Trend in Other States

alabamaarkansasconnecticutdelawarefloridageorgiaindianaiowakansaskentuckylouisianamainemarylandmassachusettsmichiganminnesotamississippimissourinebraskanew-hampshirenew-jerseynew-yorknorth-carolinaohiooklahomapennsylvaniarhode-islandsouth-carolinatennesseetexasvermontvirginiawest-virginiawisconsin

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