BirdAnalyst
BBS Route · Texas · BCR 36

Dilley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 7 survey years, still active.

71Species 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 →
7Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2018–2025Span
2Observers

Bird Species Found on Texas Dilley

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Dilley 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
Mourning DoveColumbidae902025+122%2021
Northern MockingbirdMimidae582025+19%2021
Scissor-tailed FlycatcherTyrannidae342025+7%2021
Northern BobwhiteOdontophoridae322025+73%2021
Golden-fronted WoodpeckerPicidae312025+23%2021
Northern CardinalCardinalidae302025-27%2021
Black VultureCathartidae212025+33%2022
Bewick's WrenTroglodytidae212025+159%2021
Cactus WrenTroglodytidae192025+131%2023
European StarlingSturnidae182025+5%2021
Brown-headed CowbirdIcteridae182025+4%2021
Red-winged BlackbirdIcteridae172025-29%2021
Painted BuntingCardinalidae162025-27%2021
Crested CaracaraFalconidae112025-13%2021
Common Ground DoveColumbidae102025-11%2022
Olive SparrowPasserellidae92025-51%2021
Great-tailed GrackleIcteridae82025+567%2021
Bronzed CowbirdIcteridae72025n/an/a
Ash-throated FlycatcherTyrannidae62025-54%2021
Bullock's OrioleIcteridae62025+85%2021
Cassin's SparrowPasserellidae62025-27%2021
House SparrowPasseridae62025+70%2021
Lark SparrowPasserellidae62024+200%2023
Black-bellied Whistling-DuckAnatidae52023+250%2019
Greater RoadrunnerCuculidae52025+0%2019
Brown-crested FlycatcherTyrannidae52025+30%2023
Eastern MeadowlarkIcteridae42025+0%2019
Black-crested TitmouseParidae42025-14%2022
Western Cattle-EgretArdeidae42021n/an/a
Black-throated SparrowPasserellidae42025-29%2023
Scaled QuailOdontophoridae42024n/an/a
PyrrhuloxiaCardinalidae32025+208%2021
Purple MartinHirundinidae32018n/an/a
Barn SwallowHirundinidae32025+122%2022
Bell's VireoVireonidae32025+50%2022
Eurasian Collared-DoveColumbidae32025+17%2021
House FinchFringillidae32025+33%2022
Lesser NighthawkCaprimulgidae32025+50%2024
Great KiskadeeTyrannidae32025n/an/a
Harris's HawkAccipitridae22025+8%2022

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