BirdAnalyst
BBS Route · Colorado · BCR 10

Lay Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 97 species recorded across 29 survey years, still active.

97Species 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 →
29Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1996–2025Span
3Observers

Bird Species Found on Colorado Lay

Top 40 of 97 species by most recent count. Each links to its species trend.

Species recorded on the Lay 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 MeadowlarkIcteridae1172025+57%1998
Brewer's SparrowPasserellidae612025+23%1998
Mourning DoveColumbidae522025-24%1998
Vesper SparrowPasserellidae422025-26%1998
Brewer's BlackbirdIcteridae322025-25%1998
Sage ThrasherMimidae242025-64%1998
Red-winged BlackbirdIcteridae232025-42%1998
House SparrowPasseridae192025-35%1998
Horned LarkAlaudidae182025-36%1998
Pinyon JayCorvidae182025-15%1999
American RobinTurdidae152025-27%1998
European StarlingSturnidae132025-85%1998
Cliff SwallowHirundinidae132025-35%1998
Common RavenCorvidae132025+200%2007
Green-winged TealAnatidae112025+67%2002
Wilson's SnipeScolopacidae102025+90%1998
Green-tailed TowheePasserellidae92025-25%1998
Lark SparrowPasserellidae92025+136%1999
KilldeerCharadriidae82025-22%1998
Black-billed MagpieCorvidae82025-33%1998
Wilson's PhalaropeScolopacidae72025+0%1998
Western KingbirdTyrannidae72025-18%1998
Yellow-headed BlackbirdIcteridae72025-69%1998
Barn SwallowHirundinidae72025-71%1998
BushtitAegithalidae72004n/an/a
GadwallAnatidae62025+63%1999
MallardAnatidae52025-39%1998
Say's PhoebeTyrannidae52025-63%1998
Bullock's OrioleIcteridae52025+71%1998
Northern ShovelerAnatidae52004+150%2001
Western Wood-PeweeTyrannidae52025+67%2016
Lark BuntingPasserellidae42017-69%2000
Yellow WarblerParulidae42025+0%1999
Rock WrenTroglodytidae42025+36%1998
Great Blue HeronArdeidae42025+100%2006
Eurasian Collared-DoveColumbidae42025+0%2013
Gray FlycatcherTyrannidae42025+150%2023
Woodhouse's Scrub-JayCorvidae42023-64%2022
Red-tailed HawkAccipitridae32025-33%1998
Brown-headed CowbirdIcteridae32025-75%1998

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