BirdAnalyst
BBS Route · Texas · BCR 21

Carlos Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 88 species recorded across 22 survey years, still active.

88Species 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 →
22Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1993–2025Span
8Observers

Bird Species Found on Texas Carlos

Top 40 of 88 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
Northern CardinalCardinalidae822025-15%1996
Northern MockingbirdMimidae652025-2%1996
Mourning DoveColumbidae592025+50%1996
Black VultureCathartidae462025+493%1996
Painted BuntingCardinalidae452025-18%1996
Carolina WrenTroglodytidae372025+84%1996
Western Cattle-EgretArdeidae312025+20%1996
White-eyed VireoVireonidae252025-10%1996
Cliff SwallowHirundinidae232025+322%2004
White IbisThreskiornithidae222024+100%1997
Turkey VultureCathartidae202025-58%1996
Carolina ChickadeeParidae202025+29%1996
European StarlingSturnidae182025+2%1996
Barn SwallowHirundinidae182025-11%1996
Common GrackleIcteridae152025+150%1996
Purple MartinHirundinidae152025-15%1996
American CrowCorvidae112025-88%1996
Eastern BluebirdTurdidae102025+100%1996
Yellow-billed CuckooCuculidae92025+22%1996
Brown-headed CowbirdIcteridae92025+0%1996
House SparrowPasseridae82025+136%1999
Tufted TitmouseParidae72025-43%1996
Little Blue HeronArdeidae62025+100%2007
KilldeerCharadriidae62025+44%1999
Scissor-tailed FlycatcherTyrannidae62025-53%1996
Blue JayCorvidae62025-42%1996
Western KingbirdTyrannidae62025+200%2003
White-faced IbisThreskiornithidae62024+100%2009
Downy WoodpeckerPicidae52025-6%1996
Red-bellied WoodpeckerPicidae52025-22%1996
Chimney SwiftApodidae52025-41%1996
Eastern MeadowlarkIcteridae52025-75%1996
Lark SparrowPasserellidae52025-25%1996
Summer TanagerCardinalidae52025+250%2007
House FinchFringillidae52025-23%2021
Cave SwallowHirundinidae52016n/an/a
Great Blue HeronArdeidae42025+0%1996
Red-tailed HawkAccipitridae42025+57%1997
Red-shouldered HawkAccipitridae42025+150%1997
Grasshopper SparrowPasserellidae42012+100%1999

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.