BirdAnalyst
BBS Route · Texas · BCR 36

Dilley Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 67 species recorded across 6 survey years, still active.

67Species 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 →
6Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2018–2024Span
2Observers

Bird Species Found on Texas Dilley

Top 40 of 67 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 DoveColumbidae1092024+138%2021
Northern MockingbirdMimidae732024+9%2021
Northern BobwhiteOdontophoridae472024+82%2019
Northern CardinalCardinalidae472024-24%2021
Scissor-tailed FlycatcherTyrannidae402024+32%2021
Golden-fronted WoodpeckerPicidae302024+15%2021
Painted BuntingCardinalidae272024-29%2021
Black VultureCathartidae242024+196%2021
Great-tailed GrackleIcteridae192024+567%2021
PyrrhuloxiaCardinalidae182024+317%2021
Brown-headed CowbirdIcteridae152024-4%2021
Bullock's OrioleIcteridae152024+177%2021
European StarlingSturnidae142024+21%2021
Bewick's WrenTroglodytidae132024+159%2021
Cactus WrenTroglodytidae112024+267%2022
Red-winged BlackbirdIcteridae102024-34%2021
Harris's HawkAccipitridae82024+33%2019
Olive SparrowPasserellidae82024-43%2021
Brown-crested FlycatcherTyrannidae82024+300%2022
Cassin's SparrowPasserellidae72024-31%2021
Bell's VireoVireonidae62024+33%2022
Common Ground DoveColumbidae62024+0%2022
Lark SparrowPasserellidae62024+200%2023
Black-bellied Whistling-DuckAnatidae52023+250%2019
Crested CaracaraFalconidae42024-9%2021
Western Cattle-EgretArdeidae42021n/an/a
Scaled QuailOdontophoridae42024n/an/a
Ladder-backed WoodpeckerPicidae32024+200%2018
Couch's KingbirdTyrannidae32024-43%2019
Purple MartinHirundinidae32018n/an/a
Barn SwallowHirundinidae32024+750%2019
Black-crested TitmouseParidae32024-33%2019
Eurasian Collared-DoveColumbidae32024-20%2019
Curve-billed ThrasherMimidae32023+50%2019
Red-tailed HawkAccipitridae22024+100%2018
Greater RoadrunnerCuculidae22024-43%2019
House SparrowPasseridae22024+40%2021
Yellow-billed CuckooCuculidae22024+50%2021
DickcisselCardinalidae22024-50%2021
Hooded OrioleIcteridae22023+100%2022

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