BirdAnalyst
BBS Route · Colorado · BCR 16

Thomasville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 111 species recorded across 18 survey years, still active.

111Species 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 →
18Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1992–2018Span
3Observers

Bird Species Found on Colorado Thomasville

Top 40 of 111 species by most recent count. Each links to its species trend.

Species recorded on the Thomasville 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
American RobinTurdidae322018-31%1997
Ruby-crowned KingletRegulidae292018+22%1998
Warbling VireoVireonidae262018+103%1997
Green-tailed TowheePasserellidae242018+58%1998
Northern House WrenTroglodytidae192018+72%1997
Lincoln's SparrowPasserellidae152018+225%1997
American GoldfinchFringillidae91993-18%1992
Chipping SparrowPasserellidae92018+6%1997
Violet-green SwallowHirundinidae92018-40%1997
Western TanagerCardinalidae92018+200%1998
White-crowned SparrowPasserellidae82018-29%1997
Song SparrowPasserellidae82018-52%1997
Black-capped ChickadeeParidae82007+60%1998
Western Wood-PeweeTyrannidae82018-34%1998
RedheadAnatidae61992n/an/a
Common RavenCorvidae62018+114%1998
MallardAnatidae62007+143%1999
Hermit ThrushTurdidae62018-55%1998
Steller's JayCorvidae52018+0%1997
Pine SiskinFringillidae52018-28%1997
Yellow WarblerParulidae52018+17%1997
Mountain ChickadeeParidae52018-28%1998
Mountain BluebirdTurdidae52018-50%1997
White-throated SwiftApodidae52006-38%1993
Black-headed GrosbeakCardinalidae52018+60%1998
Vesper SparrowPasserellidae52017+100%1999
Band-tailed PigeonColumbidae52005-9%2002
Brown-headed CowbirdIcteridae42018+27%1997
MacGillivray's WarblerParulidae42018-13%1998
Mourning DoveColumbidae42018+133%2001
Cliff SwallowHirundinidae42018-50%1998
Canada GooseAnatidae42018+100%1998
House FinchFringillidae31993+50%1992
Red-tailed HawkAccipitridae32018+17%1998
Dusky FlycatcherTyrannidae32018-71%1999
White-breasted NuthatchSittidae32018+0%2001
Red-breasted NuthatchSittidae32018-11%1999
Golden-crowned KingletRegulidae32007+200%2002
White-winged CrossbillFringillidae32018n/an/a
Broad-tailed HummingbirdTrochilidae22018-73%1997

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