BirdAnalyst
BBS Route · Colorado · BCR 16

Mosca Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 72 species recorded across 31 survey years, still active.

72Species 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 →
31Years 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
2Observers

Bird Species Found on Colorado Mosca

Top 40 of 72 species by most recent count. Each links to its species trend.

Species recorded on the Mosca 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
Horned LarkAlaudidae652025+1%1994
House SparrowPasseridae652025+114%1997
Brewer's SparrowPasserellidae332025-11%1994
Western MeadowlarkIcteridae262025-71%1994
Mourning DoveColumbidae212025-56%1994
Brewer's BlackbirdIcteridae182025-69%1994
Sage ThrasherMimidae182025-23%1994
Sagebrush SparrowPasserellidae16202513×1999
Lark SparrowPasserellidae162017+31%1996
Common RavenCorvidae152025+136%1995
Red-winged BlackbirdIcteridae152025-80%1994
Rock PigeonColumbidae142025-15%2008
Western KingbirdTyrannidae132025+133%1995
Cliff SwallowHirundinidae112024+36%2013
House FinchFringillidae102025+550%1996
European StarlingSturnidae82025+13%1994
Swainson's HawkAccipitridae72025+25%1995
White-faced IbisThreskiornithidae71994n/an/a
Vesper SparrowPasserellidae72025-40%2013
Black-billed MagpieCorvidae52024-87%1994
Green-winged TealAnatidae51997+150%1993
Brown-headed CowbirdIcteridae52025+117%1996
KilldeerCharadriidae42024-83%1994
Lark BuntingPasserellidae42025-12%1994
Common GrackleIcteridae41999-20%1993
Northern HarrierAccipitridae32005-17%1994
GadwallAnatidae31994-25%1993
Red-tailed HawkAccipitridae32024+17%2003
American AvocetRecurvirostridae22023-29%1994
Yellow-headed BlackbirdIcteridae22019-55%1996
Song SparrowPasserellidae22025+40%1997
Barn SwallowHirundinidae22025+30%1994
Northern PintailAnatidae21993n/an/a
Canada GooseAnatidae22004-93%1993
Long-billed CurlewScolopacidae22006-13%1995
Northern MockingbirdMimidae22025+80%1998
Great Horned OwlStrigidae22023+67%1998
Black-crowned Night HeronArdeidae22008+100%1999
Turkey VultureCathartidae22021+50%2006
MallardAnatidae12018-89%1994

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