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BBS Route · Wyoming · BCR 10

Ervay Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 90 species recorded across 32 survey years, still active.

90Species 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 →
32Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1973–2025Span
2Observers

Bird Species Found on Wyoming Ervay

Top 40 of 90 species by most recent count. Each links to its species trend.

Species recorded on the Ervay 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
Vesper SparrowPasserellidae372025-22%1975
Greater Sage-GrousePhasianidae362025+70%1976
Sage ThrasherMimidae322025-10%1975
Horned LarkAlaudidae242025-61%1975
Brewer's SparrowPasserellidae222025+30%1975
Western MeadowlarkIcteridae182025-31%1975
Mountain BluebirdTurdidae162025+217%1975
Red-winged BlackbirdIcteridae112025-64%1975
Brewer's BlackbirdIcteridae112025-25%1975
Common GrackleIcteridae112009-8%1974
Black-billed MagpieCorvidae92025+136%1976
Common NighthawkCaprimulgidae62025-68%1975
Rock WrenTroglodytidae42025+63%1975
American RobinTurdidae42025+13%1976
Pinyon JayCorvidae42009+100%1978
American WigeonAnatidae42022+100%2011
KilldeerCharadriidae32025-39%1975
American KestrelFalconidae32025-22%1975
Brown-headed CowbirdIcteridae32024+20%1987
Lark BuntingPasserellidae32023-67%1977
Loggerhead ShrikeLaniidae32025+100%1976
American GoldfinchFringillidae32024+25%1983
Green-tailed TowheePasserellidae32025+100%2010
Song SparrowPasserellidae32025+0%2010
Common RavenCorvidae32025+50%2012
Western KingbirdTyrannidae32012+50%2011
Lesser ScaupAnatidae32018n/an/a
American White PelicanPelecanidae32022n/an/a
American CrowCorvidae22025+100%1975
Yellow WarblerParulidae22025-42%1975
Lark SparrowPasserellidae22025-79%2010
MallardAnatidae22025+150%1983
Barn SwallowHirundinidae22023+20%1980
Wilson's PhalaropeScolopacidae22009+100%1976
Wilson's SnipeScolopacidae22023-29%1979
European StarlingSturnidae22024+33%1978
Golden EagleAccipitridae22024-33%1984
Cinnamon TealAnatidae22018-50%1987
Turkey VultureCathartidae22025+50%2017
American AvocetRecurvirostridae22013n/an/a

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