BirdAnalyst
BBS Route · Colorado · BCR 16

Nucla Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 108 species recorded across 25 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 →
25Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1999–2025Span
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
Spotted TowheePasserellidae282025+52%2001
Mourning DoveColumbidae262025+69%2001
Warbling VireoVireonidae192025+100%2001
Green-tailed TowheePasserellidae152025+40%2001
Clark's NutcrackerCorvidae152024+260%2007
Hermit ThrushTurdidae132025+114%2001
Dusky FlycatcherTyrannidae132025+233%2002
American RobinTurdidae112025-27%2001
Western TanagerCardinalidae92025+133%2002
Ash-throated FlycatcherTyrannidae72025+19%2002
Pine SiskinFringillidae72025-53%2003
Chipping SparrowPasserellidae72025+4%2001
Violet-green SwallowHirundinidae72025-21%2001
MacGillivray's WarblerParulidae72025+27%2001
Northern House WrenTroglodytidae72024+425%2001
Pygmy NuthatchSittidae72025-25%2004
Blue-gray GnatcatcherPolioptilidae72025+100%2003
Western BluebirdTurdidae62024+33%2004
Virginia's WarblerParulidae52025+10%2001
Lazuli BuntingCardinalidae52024-21%2008
Red CrossbillFringillidae52024-15%2009
American CrowCorvidae42025-63%2001
Plumbeous VireoVireonidae42025+75%2001
Orange-crowned WarblerParulidae42025-44%2001
Rock WrenTroglodytidae42025+200%2004
Cassin's FinchFringillidae42024+140%2004
Grace's WarblerParulidae42025+14%2002
BushtitAegithalidae42025-58%2009
Cedar WaxwingBombycillidae42021n/an/a
Broad-tailed HummingbirdTrochilidae32025-23%2001
Common RavenCorvidae32025-41%2001
Lark SparrowPasserellidae32025+71%2001
Wilson's WarblerParulidae32006-50%2000
Mountain ChickadeeParidae32025-59%2001
Black-throated Gray WarblerParulidae32024+75%2003
Vesper SparrowPasserellidae32024-43%2007
Blue GrosbeakCardinalidae32025+50%2010
Red-breasted NuthatchSittidae32024+150%2011
Woodhouse's Scrub-JayCorvidae22025-75%2001
Pinyon JayCorvidae22019-81%2001

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