BirdAnalyst
BBS Route · Colorado · BCR 18

Grover Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 78 species recorded across 28 survey years, still active.

78Species 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 →
28Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1992–2024Span
3Observers

Bird Species Found on Colorado Grover

Top 40 of 78 species by most recent count. Each links to its species trend.

Species recorded on the Grover 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 LarkAlaudidae1422024-78%1994
Western MeadowlarkIcteridae932024-32%1994
European StarlingSturnidae662024+374%1995
Mourning DoveColumbidae492024+72%1994
Lark BuntingPasserellidae332024-85%1994
Western KingbirdTyrannidae282024+116%1994
Common GrackleIcteridae232024+9%1994
House SparrowPasseridae182024+55%1994
Thick-billed LongspurCalcariidae172024-67%1994
Red-winged BlackbirdIcteridae152024+70%1994
Canada GooseAnatidae152018+206%2008
KilldeerCharadriidae102024-30%1994
Rock PigeonColumbidae92023+119%1994
Brown-headed CowbirdIcteridae92024+40%1994
Lark SparrowPasserellidae82024+300%2003
MallardAnatidae52023-53%1994
American RobinTurdidae52024-39%1994
Brewer's BlackbirdIcteridae42023+14%1994
Mountain PloverCharadriidae42021+200%1999
Grasshopper SparrowPasserellidae42023+22%1999
Cassin's SparrowPasserellidae42024-13%2008
American WigeonAnatidae42008n/an/a
Loggerhead ShrikeLaniidae32023-30%1994
Yellow WarblerParulidae32024+67%2001
Yellow-headed BlackbirdIcteridae32019+20%2005
House FinchFringillidae32024+0%1995
Great Blue HeronArdeidae32013+0%2002
Black-billed MagpieCorvidae32024+200%2013
Barn SwallowHirundinidae22024-71%1994
Northern PintailAnatidae22021-54%2003
Red-tailed HawkAccipitridae22024-25%2000
Common NighthawkCaprimulgidae22023-68%2000
Brown ThrasherMimidae22024+67%2006
American White PelicanPelecanidae22019-67%1999
Northern Rough-winged SwallowHirundinidae21999n/an/a
GadwallAnatidae22022+60%2002
Wilson's SnipeScolopacidae22023-50%2002
American KestrelFalconidae22009+100%2001
Bullock's OrioleIcteridae22024+0%2002
Northern MockingbirdMimidae22023+100%2003

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