BirdAnalyst
BBS Route · Texas · BCR 21

Thornton Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 70 species recorded across 16 survey years, no longer active.

70Species 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 →
16Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–1984Span
1Observers

Bird Species Found on Texas Thornton

Top 40 of 70 species by most recent count. Each links to its species trend.

Species recorded on the Thornton 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
Western Cattle-EgretArdeidae1401984+805%1976
American CrowCorvidae581984+105%1970
Eastern MeadowlarkIcteridae581984-18%1970
Northern MockingbirdMimidae461984-34%1970
Northern CardinalCardinalidae431984+7%1970
Barn SwallowHirundinidae341984+276%1970
Mourning DoveColumbidae331984-12%1970
Northern BobwhiteOdontophoridae271984-45%1970
Great-tailed GrackleIcteridae231984+84%1970
House SparrowPasseridae201984+38%1970
Chimney SwiftApodidae151984+28%1970
Turkey VultureCathartidae131984+18%1970
DickcisselCardinalidae131983+10%1970
European StarlingSturnidae111984+210%1970
KilldeerCharadriidae91983+69%1970
Common GrackleIcteridae91984+208%1975
Carolina WrenTroglodytidae81984+0%1970
Carolina ChickadeeParidae71984+88%1970
Eastern BluebirdTurdidae71984+21%1970
Yellow-billed CuckooCuculidae61984-15%1970
Painted BuntingCardinalidae61984-67%1970
Red-bellied WoodpeckerPicidae51984+118%1970
Tufted TitmouseParidae51984-48%1971
Cliff SwallowHirundinidae51981-62%1977
Scissor-tailed FlycatcherTyrannidae41984-56%1970
Eastern Wood-PeweeTyrannidae41984-32%1970
Eastern PhoebeTyrannidae41982+300%1969
Red-tailed HawkAccipitridae31984+100%1971
Indigo BuntingCardinalidae31979+200%1968
Great EgretArdeidae31984-77%1969
Purple MartinHirundinidae31984-13%1971
Great Blue HeronArdeidae31984+167%1975
Red-headed WoodpeckerPicidae21980-73%1969
Red-winged BlackbirdIcteridae21984+109%1970
Lark SparrowPasserellidae21984-78%1970
Grasshopper SparrowPasserellidae21979+367%1974
Northern Rough-winged SwallowHirundinidae21982+100%1974
Little Blue HeronArdeidae21982+100%1977
White-breasted NuthatchSittidae21979n/an/a
Eastern KingbirdTyrannidae11984-38%1971

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