BirdAnalyst
BBS Route · Colorado · BCR 18

Karval Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 71 species recorded across 16 survey years, still active.

71Species 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 →
16Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1995–2019Span
3Observers

Bird Species Found on Colorado Karval

Top 40 of 71 species by most recent count. Each links to its species trend.

Species recorded on the Karval 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
Western MeadowlarkIcteridae2742019-21%1998
Lark BuntingPasserellidae1982019-33%1998
Horned LarkAlaudidae1032019-66%1998
Mourning DoveColumbidae312019-66%1998
Cassin's SparrowPasserellidae182019-80%1998
Western KingbirdTyrannidae152019-46%1998
Swainson's HawkAccipitridae122019+72%1998
Green-winged TealAnatidae122014n/an/a
Red-winged BlackbirdIcteridae82019-11%1998
Yellow WarblerParulidae82001n/an/a
MallardAnatidae62019+100%2002
Brewer's SparrowPasserellidae52017-42%2001
House SparrowPasseridae52019-49%2001
Rock PigeonColumbidae42017-27%1998
Northern MockingbirdMimidae42019-19%1998
Wilson's PhalaropeScolopacidae42017+250%2005
Blue-winged TealAnatidae42019-27%2014
Northern ShovelerAnatidae42019+100%2005
KilldeerCharadriidae32019-68%1998
Brown-headed CowbirdIcteridae32017-74%1998
Common GrackleIcteridae32019-78%2001
American RobinTurdidae32003+167%2001
Ring-necked PheasantPhasianidae32016-40%1996
Cliff SwallowHirundinidae32019-84%2001
American CootRallidae32015n/an/a
Northern PintailAnatidae32019n/an/a
Red-tailed HawkAccipitridae22018+140%2001
Great Horned OwlStrigidae22018+0%1996
Common NighthawkCaprimulgidae22019-81%1998
European StarlingSturnidae22019-6%2001
Bullock's OrioleIcteridae22019-44%2001
Grasshopper SparrowPasserellidae22018-50%1998
Barn SwallowHirundinidae22018-87%1998
Long-billed CurlewScolopacidae21996n/an/a
House FinchFringillidae21996n/an/a
Blue GrosbeakCardinalidae22016-20%2002
GadwallAnatidae22016+33%2005
American AvocetRecurvirostridae22019-50%2014
Eastern KingbirdTyrannidae22017+0%2005
Eurasian Collared-DoveColumbidae22019+33%2014

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