BirdAnalyst
BBS Route · Texas · BCR 21

Gambill Ref. Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 89 species recorded across 13 survey years, still active.

89Species 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 →
13Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1995–2025Span
5Observers

Bird Species Found on Texas Gambill Ref.

Top 40 of 89 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
DickcisselCardinalidae582025-21%2012
Barn SwallowHirundinidae512025+7%2012
American CrowCorvidae402025+16%2012
Northern MockingbirdMimidae402025-30%2012
Northern CardinalCardinalidae382025-8%2012
Eastern MeadowlarkIcteridae292025-43%2012
Mourning DoveColumbidae272025+11%2012
Red-winged BlackbirdIcteridae222025-4%2012
Indigo BuntingCardinalidae162025+188%2012
Great-tailed GrackleIcteridae151995n/an/a
Carolina WrenTroglodytidae142025+100%2012
Brown-headed CowbirdIcteridae122025-56%2012
White-eyed VireoVireonidae122025+92%2012
House SparrowPasseridae122025-38%2012
Tufted TitmouseParidae122025+17%2012
Scissor-tailed FlycatcherTyrannidae112025-25%2012
Turkey VultureCathartidae102025-17%2012
Blue JayCorvidae102025-34%2012
Red-bellied WoodpeckerPicidae92025-25%2012
European StarlingSturnidae92025+11%2012
Eurasian Collared-DoveColumbidae82025+157%2014
Blue-gray GnatcatcherPolioptilidae72025+14%2012
Cliff SwallowHirundinidae7202512×2016
Western Cattle-EgretArdeidae62023+191%2009
Painted BuntingCardinalidae62025+4%2012
Eastern BluebirdTurdidae62025-29%2012
Great Blue HeronArdeidae52025+33%2012
Eastern PhoebeTyrannidae52025+164%2012
Red-eyed VireoVireonidae52025+220%2012
Carolina ChickadeeParidae52025-27%2012
American RobinTurdidae52025-24%2013
Wood DuckAnatidae42023+100%1995
Lark SparrowPasserellidae42025+150%2012
Summer TanagerCardinalidae42025-14%2012
Canada GooseAnatidae42025+33%2009
Great EgretArdeidae42025+17%2016
Red-shouldered HawkAccipitridae42024+50%2017
Northern ParulaParulidae42025+200%2023
Horned LarkAlaudidae42025+10%2016
House FinchFringillidae42025+300%2024

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