BirdAnalyst
BBS Route · Colorado · BCR 16

Animas Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 88 species recorded across 8 survey years, no longer active.

88Species 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 →
8Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1996–2004Span
3Observers

Bird Species Found on Colorado Animas

Top 40 of 88 species by most recent count. Each links to its species trend.

Species recorded on the Animas 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
Common RavenCorvidae512004+173%1999
Cliff SwallowHirundinidae382004-58%1998
European StarlingSturnidae332004+51%1998
American RobinTurdidae252004-48%1998
Red-winged BlackbirdIcteridae212004+50%1998
Black-headed GrosbeakCardinalidae212004+10%1998
Western MeadowlarkIcteridae182004-54%1998
Mourning DoveColumbidae152004+104%1998
Western Wood-PeweeTyrannidae152004-54%1998
Chipping SparrowPasserellidae132004-50%1998
Mountain BluebirdTurdidae132004-26%1998
Black-billed MagpieCorvidae122004-46%1998
Brewer's BlackbirdIcteridae122004-81%1998
American CrowCorvidae122004+650%2000
Bewick's WrenTroglodytidae112000+26%1997
Blue-gray GnatcatcherPolioptilidae112000+200%1997
Ash-throated FlycatcherTyrannidae102004-48%1998
Pinyon JayCorvidae102003+52%1998
Woodhouse's Scrub-JayCorvidae92004-29%1998
Canada GooseAnatidae92003+29%2002
BushtitAegithalidae82004+200%1998
Brown-headed CowbirdIcteridae72004-54%1998
Gray VireoVireonidae72004+467%1998
Cassin's KingbirdTyrannidae62004-6%1998
Common GrackleIcteridae62000+250%1997
Violet-green SwallowHirundinidae62004-91%1998
Northern Rough-winged SwallowHirundinidae62000+167%1997
Yellow WarblerParulidae62004-69%1998
Gray FlycatcherTyrannidae52004+8%1998
Western BluebirdTurdidae52003+17%2000
Rock PigeonColumbidae42004+33%1996
House FinchFringillidae42004-35%1998
House SparrowPasseridae42004-76%1998
Juniper TitmouseParidae42004+40%1999
Red-tailed HawkAccipitridae32004+14%1998
Bullock's OrioleIcteridae32003-80%1998
Spotted TowheePasserellidae32003-7%1998
Tree SwallowHirundinidae32004-17%1999
Northern MockingbirdMimidae32003-40%1996
Northern House WrenTroglodytidae32004-87%1998

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