BirdAnalyst
BBS Route · Montana · BCR 17

Custer Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 60 species recorded across 2 survey years, no longer active.

60Species 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 →
2Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2019–2022Span
2Observers

Bird Species Found on Montana Custer

Top 40 of 60 species by most recent count. Each links to its species trend.

Species recorded on the Custer 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 MeadowlarkIcteridae2452022+66%2019
Cliff SwallowHirundinidae1452022n/an/a
Vesper SparrowPasserellidae992022+350%2019
Lark BuntingPasserellidae542022+8%2019
Brewer's SparrowPasserellidae372022+517%2019
Lark SparrowPasserellidae352022-21%2019
Brown-headed CowbirdIcteridae332022+200%2019
Red-winged BlackbirdIcteridae332022+38%2019
Western Wood-PeweeTyrannidae232022+188%2019
Field SparrowPasserellidae222022+144%2019
Northern House WrenTroglodytidae212022+24%2019
Western KingbirdTyrannidae202022+150%2019
Horned LarkAlaudidae202022+900%2019
Spotted TowheePasserellidae192022+850%2019
House SparrowPasseridae192022-10%2019
Mourning DoveColumbidae172022-72%2019
Yellow WarblerParulidae122022-8%2019
Common GrackleIcteridae112022+450%2019
American CrowCorvidae102022+0%2019
Grasshopper SparrowPasserellidae102022+100%2019
KilldeerCharadriidae92022+125%2019
Ring-necked PheasantPhasianidae92022-40%2019
Barn SwallowHirundinidae72022+17%2019
Common RavenCorvidae72022n/an/a
Brewer's BlackbirdIcteridae62022-14%2019
Chipping SparrowPasserellidae62019n/an/a
Savannah SparrowPasserellidae52019n/an/a
American RobinTurdidae52022-44%2019
Mountain BluebirdTurdidae52019n/an/a
European StarlingSturnidae42022-75%2019
Yellow-breasted ChatIcteriidae42022n/an/a
Rock WrenTroglodytidae42022n/an/a
Rock PigeonColumbidae32022+50%2019
Red-tailed HawkAccipitridae32019n/an/a
Say's PhoebeTyrannidae32022-25%2019
Eastern KingbirdTyrannidae32022n/an/a
MallardAnatidae22019n/an/a
Sharp-tailed GrousePhasianidae22019n/an/a
Short-eared OwlStrigidae22019n/an/a
Baltimore OrioleIcteridae22019n/an/a

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