BirdAnalyst
BBS Route · Texas · BCR 21

Thornton 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 83 species recorded across 25 survey years, no longer active.

83Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
25Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1985–2010Span
3Observers

Bird Species Found on Texas Thornton 2

Top 40 of 83 species by most recent count. Each links to its species trend.

Species recorded on the Thornton 2 route.
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 →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
Northern CardinalCardinalidae1102010+118%1987
Painted BuntingCardinalidae492010+187%1987
Barn SwallowHirundinidae492010-8%1987
Northern MockingbirdMimidae402010+0%1987
Cliff SwallowHirundinidae382010+571%1992
Turkey VultureCathartidae322010+64%1987
House SparrowPasseridae292010+34%1987
American CrowCorvidae282010+26%1987
Scissor-tailed FlycatcherTyrannidae252010+40%1987
Carolina ChickadeeParidae212010+239%1987
Cave SwallowHirundinidae192010+162%2004
Eurasian Collared-DoveColumbidae162010+300%2009
Yellow-billed CuckooCuculidae142010+46%1987
Brown-headed CowbirdIcteridae142010+27%1987
Mourning DoveColumbidae132010+24%1987
Tufted TitmouseParidae132010+7%1988
Great-tailed GrackleIcteridae122010+5%1987
Carolina WrenTroglodytidae122010+140%1987
KilldeerCharadriidae112010+320%1992
Eastern PhoebeTyrannidae102010+480%1991
Black VultureCathartidae92010-8%1987
Red-bellied WoodpeckerPicidae92010+26%1987
Eastern MeadowlarkIcteridae82010-77%1987
White-eyed VireoVireonidae82010+513%1988
Northern Rough-winged SwallowHirundinidae82010+500%1998
Common GrackleIcteridae72010-84%1987
Western KingbirdTyrannidae62010+260%1988
Great Crested FlycatcherTyrannidae62010+80%1987
Lark SparrowPasserellidae62009-10%1987
Eastern BluebirdTurdidae52010-24%1987
Eastern KingbirdTyrannidae52001+67%1991
Grasshopper SparrowPasserellidae52010+129%1999
Purple MartinHirundinidae42008-38%1988
DickcisselCardinalidae42010-65%1989
Blue-gray GnatcatcherPolioptilidae42004+100%2000
Western Cattle-EgretArdeidae32010-53%1987
American RobinTurdidae32010+125%1989
Yellow-throated VireoVireonidae32010-33%2000
Bank SwallowHirundinidae32009-89%2003
Red-tailed HawkAccipitridae22010+50%1987

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.