BirdAnalyst
BBS Route · Wyoming · BCR 17

Bill Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 82 species recorded across 10 survey years, still active.

82Species 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 →
10Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1974–2018Span
5Observers

Bird Species Found on Wyoming Bill

Top 40 of 82 species by most recent count. Each links to its species trend.

Species recorded on the Bill 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
Cliff SwallowHirundinidae1882018-32%1993
Lark BuntingPasserellidae1752018-58%1993
Western MeadowlarkIcteridae1432018+117%1993
Brewer's BlackbirdIcteridae672018+31%1993
Canada GooseAnatidae362018n/an/a
Horned LarkAlaudidae352018-75%1993
European StarlingSturnidae292018+175%1996
Yellow WarblerParulidae25199925×1974
Chipping SparrowPasserellidae20200113×1997
Mourning DoveColumbidae192018+12%1993
Western KingbirdTyrannidae192018+230%1997
Northern PintailAnatidae102000+400%1999
American White PelicanPelecanidae102018n/an/a
KilldeerCharadriidae92018-45%1993
Common NighthawkCaprimulgidae92018-35%1993
Barn SwallowHirundinidae82018-50%1997
Grasshopper SparrowPasserellidae82018+306%1996
Common GrackleIcteridae82018+325%1997
Clay-colored SparrowPasserellidae82001+80%1997
GadwallAnatidae71999-42%1993
Blue-winged TealAnatidae71998+250%1993
House SparrowPasseridae62018+80%1993
Brown-headed CowbirdIcteridae62018+467%1997
Sagebrush SparrowPasserellidae62001+0%1999
Red-winged BlackbirdIcteridae52018+132%1993
American WigeonAnatidae52000+120%1996
Wilson's PhalaropeScolopacidae52018+150%1998
Green-winged TealAnatidae52000n/an/a
American RobinTurdidae42018+40%1993
MallardAnatidae42018-45%1998
Greater Sage-GrousePhasianidae31999-40%1974
Red-tailed HawkAccipitridae32018+17%1996
Loggerhead ShrikeLaniidae32018-58%1993
Bank SwallowHirundinidae32000-21%1996
CanvasbackAnatidae32000n/an/a
Black-throated Gray WarblerParulidae32000n/an/a
Ferruginous HawkAccipitridae21999+33%1992
American KestrelFalconidae22018+33%1993
Eastern KingbirdTyrannidae22018+50%1993
Field SparrowPasserellidae22001+100%1997

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