BirdAnalyst
BBS Route · Colorado · BCR 18

Arsenal 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 81 species recorded across 9 survey years, still active.

81Species 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 →
9Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2016–2025Span
3Observers

Bird Species Found on Colorado Arsenal 2

Top 40 of 81 species by most recent count. Each links to its species trend.

Species recorded on the Arsenal 2 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 MeadowlarkIcteridae1222025-27%2018
Lark BuntingPasserellidae952025+196%2019
European StarlingSturnidae882025+580%2018
Cliff SwallowHirundinidae742025+203%2018
Horned LarkAlaudidae582025+291%2018
Mourning DoveColumbidae492025+19%2018
Western KingbirdTyrannidae472025-29%2018
Red-winged BlackbirdIcteridae462025+22%2018
Burrowing OwlStrigidae342025+450%2018
Grasshopper SparrowPasserellidae252025+44%2018
Yellow WarblerParulidae232025+117%2018
Lark SparrowPasserellidae212025+240%2018
Northern House WrenTroglodytidae192025-9%2018
American RobinTurdidae162025+0%2018
Common GrackleIcteridae142025+105%2018
Brown-headed CowbirdIcteridae132025+100%2018
Yellow-headed BlackbirdIcteridae132024+600%2017
Red-tailed HawkAccipitridae122025+38%2018
Bullock's OrioleIcteridae122025-32%2018
Cassin's SparrowPasserellidae122025+200%2021
Western Wood-PeweeTyrannidae92025+150%2018
Black-billed MagpieCorvidae72025-8%2018
Eurasian Collared-DoveColumbidae72025+167%2022
House FinchFringillidae72025+14%2022
Blue GrosbeakCardinalidae62025-9%2021
Rock PigeonColumbidae62024-54%2021
American AvocetRecurvirostridae62022n/an/a
Double-crested CormorantPhalacrocoracidae52025+13%2018
KilldeerCharadriidae52025+14%2021
Barn SwallowHirundinidae42025+0%2021
Common YellowthroatParulidae42025+10%2022
Swainson's HawkAccipitridae32025-38%2018
Say's PhoebeTyrannidae32025-25%2022
Northern MockingbirdMimidae32024-22%2021
Brewer's BlackbirdIcteridae32019n/an/a
Northern ShovelerAnatidae32022n/an/a
DickcisselCardinalidae32024n/an/a
MallardAnatidae22025+290%2021
Canada GooseAnatidae22024+50%2019
Blue JayCorvidae22025+100%2021

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