BirdAnalyst
BBS Route · Colorado · BCR 18

Haswell Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 70 species recorded across 22 survey years, still active.

70Species 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 →
22Years 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
2Observers

Bird Species Found on Colorado Haswell

Top 40 of 70 species by most recent count. Each links to its species trend.

Species recorded on the Haswell 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 LarkAlaudidae3122024-60%1994
Western MeadowlarkIcteridae772024-84%1994
Mourning DoveColumbidae672024-55%1994
Red-winged BlackbirdIcteridae352024-32%1994
Lark BuntingPasserellidae312024-74%1994
Cassin's SparrowPasserellidae292024-88%1994
Cliff SwallowHirundinidae212009-81%1994
Green-winged TealAnatidae192022+850%1994
Canada GooseAnatidae182024+20%2006
Ring-billed GullLaridae162010+230%1994
Burrowing OwlStrigidae162024+713%1994
Western KingbirdTyrannidae142024+93%1994
Grasshopper SparrowPasserellidae142024-85%1994
Common GrackleIcteridae132024+209%1996
DickcisselCardinalidae132024+190%2007
Swainson's HawkAccipitridae122024+600%1994
MallardAnatidae102022-35%1997
Northern ShovelerAnatidae102006-31%1996
Blue-winged TealAnatidae102006+233%1998
Scaled QuailOdontophoridae102024+750%2009
Red-tailed HawkAccipitridae92024+460%1994
American White PelicanPelecanidae62024-93%1995
Northern MockingbirdMimidae62024+600%2003
Blue GrosbeakCardinalidae62024+275%2009
Double-crested CormorantPhalacrocoracidae62006n/an/a
Long-billed CurlewScolopacidae51999+160%1995
Common NighthawkCaprimulgidae52024-85%1994
House SparrowPasseridae52022+50%1997
KilldeerCharadriidae42024-76%1994
American WigeonAnatidae41996n/an/a
GadwallAnatidae42022+300%1997
Great Blue HeronArdeidae31999+200%1993
Great Horned OwlStrigidae32011-33%2008
American CootRallidae31996+200%1994
American KestrelFalconidae32024+67%2001
Eared GrebePodicipedidae32022n/an/a
Snowy PloverCharadriidae22007+0%1992
Lark SparrowPasserellidae22024-95%1994
Barn SwallowHirundinidae22023-89%1994
Least TernLaridae21994+100%1993

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