BirdAnalyst
BBS Route · Colorado · BCR 16

Nucla Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 108 species recorded across 24 survey years, still active.

108Species 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 →
24Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1999–2024Span
2Observers

Bird Species Found on Colorado Nucla

Top 40 of 108 species by most recent count. Each links to its species trend.

Species recorded on the Nucla 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 DoveColumbidae322024+38%2001
Spotted TowheePasserellidae252024+36%2001
Warbling VireoVireonidae252024+119%2001
American RobinTurdidae212024-21%2001
Green-tailed TowheePasserellidae162024+66%2001
Clark's NutcrackerCorvidae152024+260%2007
Chipping SparrowPasserellidae142024+25%2001
Hermit ThrushTurdidae142024+127%2001
Black-headed GrosbeakCardinalidae132024+63%2003
Virginia's WarblerParulidae122024+21%2001
Dusky FlycatcherTyrannidae122024+225%2002
Ash-throated FlycatcherTyrannidae112024+27%2002
Western TanagerCardinalidae102024+167%2002
Common RavenCorvidae82024-31%2001
Northern House WrenTroglodytidae72024+425%2001
Blue-gray GnatcatcherPolioptilidae72024+156%2003
American CrowCorvidae62024-71%2001
Lark SparrowPasserellidae62024+71%2001
Orange-crowned WarblerParulidae62024-48%2001
Western BluebirdTurdidae62024+33%2004
Grace's WarblerParulidae62024+0%2002
Broad-tailed HummingbirdTrochilidae52024-31%2001
MacGillivray's WarblerParulidae52024+13%2001
Rock WrenTroglodytidae52024+160%2004
Lazuli BuntingCardinalidae52024-21%2008
Mountain BluebirdTurdidae52024+30%2002
Red CrossbillFringillidae52024-15%2009
Black-billed MagpieCorvidae42021-47%2001
Woodhouse's Scrub-JayCorvidae42024-71%2001
Plumbeous VireoVireonidae42024+88%2001
Yellow WarblerParulidae42024+25%2001
Cassin's FinchFringillidae42024+140%2004
Pygmy NuthatchSittidae42024+35%2004
Cedar WaxwingBombycillidae42021n/an/a
Violet-green SwallowHirundinidae32024-37%2001
Wilson's WarblerParulidae32006-50%2000
Mountain ChickadeeParidae32024-65%2001
Ruby-crowned KingletRegulidae32024-55%2001
Common NighthawkCaprimulgidae32024+86%2003
Black-throated Gray WarblerParulidae32024+75%2003

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