BirdAnalyst
BBS Route · Texas · BCR 21

Carlos Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 87 species recorded across 21 survey years, still active.

87Species 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 →
21Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1993–2024Span
8Observers

Bird Species Found on Texas Carlos

Top 40 of 87 species by most recent count. Each links to its species trend.

Species recorded on the Carlos 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-EgretArdeidae2632024+14%1996
Northern CardinalCardinalidae902024-16%1996
Northern MockingbirdMimidae622024-7%1996
Mourning DoveColumbidae472024+6%1996
Painted BuntingCardinalidae442024-22%1996
Carolina WrenTroglodytidae422024+75%1996
Barn SwallowHirundinidae372024-2%1996
European StarlingSturnidae272024-8%1996
White IbisThreskiornithidae222024+100%1997
Carolina ChickadeeParidae212024+31%1996
White-eyed VireoVireonidae172024-30%1996
Purple MartinHirundinidae162024-23%1996
Yellow-billed CuckooCuculidae132024+17%1996
Cliff SwallowHirundinidae122024+289%2004
House SparrowPasseridae122024+127%1999
Scissor-tailed FlycatcherTyrannidae102024-51%1996
American CrowCorvidae102024-88%1996
Western KingbirdTyrannidae82024+200%2003
Great EgretArdeidae72024+25%1997
Brown-headed CowbirdIcteridae72024-40%1996
Downy WoodpeckerPicidae62024+0%1996
Blue-gray GnatcatcherPolioptilidae62024-13%1996
Red-winged BlackbirdIcteridae62024+333%2009
White-faced IbisThreskiornithidae62024+100%2009
KilldeerCharadriidae52024+22%1999
Black VultureCathartidae52024+467%1996
Red-bellied WoodpeckerPicidae52024-11%1996
Blue JayCorvidae52024-42%1996
Common GrackleIcteridae52022+33%1996
Eastern BluebirdTurdidae52024+64%1996
Summer TanagerCardinalidae52024+200%2007
Cave SwallowHirundinidae52016n/an/a
Chimney SwiftApodidae42024-55%1996
Eastern MeadowlarkIcteridae42024-80%1996
Tufted TitmouseParidae42024-60%1996
Grasshopper SparrowPasserellidae42012+100%1999
Acadian FlycatcherTyrannidae42012+300%2006
House FinchFringillidae42024-39%2021
Red-tailed HawkAccipitridae32024+14%1997
Lark SparrowPasserellidae32024+0%1996

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