BirdAnalyst
BBS Route · Texas · BCR 21

Gambill Ref. Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 88 species recorded across 12 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 →
12Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1995–2024Span
5Observers

Bird Species Found on Texas Gambill Ref.

Top 40 of 88 species by most recent count. Each links to its species trend.

Species recorded on the Gambill Ref. 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
DickcisselCardinalidae602024-35%2012
American CrowCorvidae552024-8%2012
Barn SwallowHirundinidae472024-25%2012
Northern CardinalCardinalidae412024-33%2012
Eastern MeadowlarkIcteridae352024-50%2012
Northern MockingbirdMimidae312024-48%2012
Red-winged BlackbirdIcteridae262024-27%2012
Carolina WrenTroglodytidae192024+44%2012
Cliff SwallowHirundinidae19202412×2016
Mourning DoveColumbidae182024-24%2012
Indigo BuntingCardinalidae182024+100%2012
Scissor-tailed FlycatcherTyrannidae162024-19%2012
Great-tailed GrackleIcteridae151995n/an/a
House SparrowPasseridae152024-57%2012
Eastern PhoebeTyrannidae122024+136%2012
Painted BuntingCardinalidae122024-13%2012
Tufted TitmouseParidae112024-3%2012
Northern Rough-winged SwallowHirundinidae102019+900%2015
Yellow-billed CuckooCuculidae92024-25%2012
Purple MartinHirundinidae82024-35%2012
Canada GooseAnatidae82014+167%2009
Blue JayCorvidae72024-49%2012
White-eyed VireoVireonidae72024+15%2012
American RobinTurdidae72024-43%2009
Western Cattle-EgretArdeidae62023+191%2009
Turkey VultureCathartidae62024+7%2012
Red-bellied WoodpeckerPicidae62024-50%2012
Brown-headed CowbirdIcteridae62024-74%2012
Red-eyed VireoVireonidae62024+140%2012
Carolina ChickadeeParidae62024-41%2012
Eastern BluebirdTurdidae62024-52%2012
Eurasian Collared-DoveColumbidae62024+57%2014
Blue-gray GnatcatcherPolioptilidae52024-29%2012
Horned LarkAlaudidae52021+10%2016
Wood DuckAnatidae42023+100%1995
Chimney SwiftApodidae42017-55%2012
Eastern KingbirdTyrannidae42024-66%2012
Red-shouldered HawkAccipitridae42024+50%2017
Northern BobwhiteOdontophoridae32024-89%2009
Fish CrowCorvidae32024-56%2012

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