BirdAnalyst
BBS Route · Texas · BCR 35

Castolon Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 67 species recorded across 29 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 →
29Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1994–2025Span
4Observers

Bird Species Found on Texas Castolon

Top 40 of 67 species by most recent count. Each links to its species trend.

Species recorded on the Castolon 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 CardinalCardinalidae202025+40%1997
Black-throated SparrowPasserellidae162025-78%1996
Bell's VireoVireonidae122025-17%1996
White-winged DoveColumbidae112025-75%1996
PyrrhuloxiaCardinalidae92025-46%1996
Lesser NighthawkCaprimulgidae82024-76%1996
Northern MockingbirdMimidae82025-83%1996
Cactus WrenTroglodytidae82025-62%1996
VerdinRemizidae82025-57%1996
Ash-throated FlycatcherTyrannidae72025-57%1996
Painted BuntingCardinalidae72025+280%1996
Yellow-breasted ChatIcteriidae62025-83%1996
Brown-headed CowbirdIcteridae52025-67%1996
Canyon WrenTroglodytidae52025+143%1996
Black-tailed GnatcatcherPolioptilidae52025-57%1996
Mourning DoveColumbidae42024-20%1996
Ladder-backed WoodpeckerPicidae42025+20%1998
Canyon TowheePasserellidae42025-56%1996
Blue GrosbeakCardinalidae42025+129%1996
Eurasian Collared-DoveColumbidae32018+50%2011
Turkey VultureCathartidae22025-21%1996
Red-tailed HawkAccipitridae22019+25%2000
Greater RoadrunnerCuculidae22025-17%1996
Rufous-crowned SparrowPasserellidae22025-86%1996
Cliff SwallowHirundinidae22015+57%1997
Rock WrenTroglodytidae22025+167%1996
Inca DoveColumbidae22004+0%1999
Scaled QuailOdontophoridae12025-43%1996
Say's PhoebeTyrannidae12024-75%1996
Common RavenCorvidae12023-50%1998
Scott's OrioleIcteridae12025-86%1996
House FinchFringillidae12025-83%1996
Varied BuntingCardinalidae12025-64%1996
Summer TanagerCardinalidae12025-64%1997
PhainopeplaPtiliogonatidae12001+0%1994
Bewick's WrenTroglodytidae12025-71%1997
Loggerhead ShrikeLaniidae12025+267%2001
Common PoorwillCaprimulgidae12017-83%1996
Western KingbirdTyrannidae12014-17%1998
Vermilion FlycatcherTyrannidae12025-43%2000

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