BirdAnalyst
BBS Route · Colorado · BCR 16

Thomasville Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 112 species recorded across 19 survey years, still active.

112Species 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 →
19Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1992–2025Span
4Observers

Bird Species Found on Colorado Thomasville

Top 40 of 112 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 RobinTurdidae332025-31%1997
Warbling VireoVireonidae262025+119%1997
Pine SiskinFringillidae202025-16%1997
Ruby-crowned KingletRegulidae172025+24%1998
Green-tailed TowheePasserellidae172025+44%1998
Broad-tailed HummingbirdTrochilidae162025-64%1997
Lincoln's SparrowPasserellidae152018+225%1997
Violet-green SwallowHirundinidae122025-30%1997
Western TanagerCardinalidae122025+220%1998
Orange-crowned WarblerParulidae122025-62%2001
Dusky FlycatcherTyrannidae112025-55%1999
Chipping SparrowPasserellidae102025+59%1997
MacGillivray's WarblerParulidae102025-25%1998
Northern House WrenTroglodytidae102025+72%1997
American GoldfinchFringillidae91993-18%1992
Black-capped ChickadeeParidae82007+60%1998
Western Wood-PeweeTyrannidae72025-28%1998
RedheadAnatidae61992n/an/a
Brown-headed CowbirdIcteridae62025+64%1997
Mountain ChickadeeParidae62025-11%1998
MallardAnatidae62007+143%1999
White-crowned SparrowPasserellidae52025-38%1997
Song SparrowPasserellidae52025-45%1997
White-throated SwiftApodidae52006-38%1993
Hermit ThrushTurdidae52025-47%1998
Band-tailed PigeonColumbidae52005-9%2002
Mountain BluebirdTurdidae42025-38%1997
Red-naped SapsuckerPicidae42025+60%1999
Cliff SwallowHirundinidae42018-50%1998
Canada GooseAnatidae42018+100%1998
Virginia's WarblerParulidae42025+0%2001
Steller's JayCorvidae32025+0%1997
Common RavenCorvidae32025+114%1998
House FinchFringillidae31993+50%1992
Lazuli BuntingCardinalidae32025+80%2002
White-breasted NuthatchSittidae32018+0%2001
Red-breasted NuthatchSittidae32018-11%1999
Cedar WaxwingBombycillidae32025+200%2001
Golden-crowned KingletRegulidae32007+200%2002
White-winged CrossbillFringillidae32018n/an/a

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