BirdAnalyst
BBS Route · Wisconsin · BCR 23

Casco Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 149 species recorded across 54 survey years, still active.

149Species 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 →
54Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2024Span
7Observers

Bird Species Found on Wisconsin Casco

Top 40 of 149 species by most recent count. Each links to its species trend.

Species recorded on the Casco 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
Red-winged BlackbirdIcteridae812024-46%1970
European StarlingSturnidae442024-35%1970
Canada GooseAnatidae432023+142%1989
Song SparrowPasserellidae402024+166%1970
American RobinTurdidae402024+94%1970
Cedar WaxwingBombycillidae362024+943%1973
American CrowCorvidae322024-5%1970
House SparrowPasseridae312024-64%1970
Chipping SparrowPasserellidae31202419×1977
Savannah SparrowPasserellidae292024-41%1970
Barn SwallowHirundinidae272024+53%1970
Northern House WrenTroglodytidae242024+560%1970
Cliff SwallowHirundinidae202024+314%1970
Indigo BuntingCardinalidae192024+457%1970
KilldeerCharadriidae172024-11%1970
Pine SiskinFringillidae161988n/an/a
Mourning DoveColumbidae152024+354%1970
Red-eyed VireoVireonidae152024+463%1971
American White PelicanPelecanidae142024+14%2005
House FinchFringillidae132024-16%1996
Rock PigeonColumbidae112024-12%1972
Eastern MeadowlarkIcteridae112024-88%1970
Northern CardinalCardinalidae112024+440%1977
Common GrackleIcteridae102024+119%1970
American GoldfinchFringillidae92024+107%1970
Gray CatbirdMimidae92024+213%1972
Brown-headed CowbirdIcteridae62024+4%1970
Yellow WarblerParulidae62024+580%1971
Common YellowthroatParulidae62024+575%1972
Warbling VireoVireonidae62024+633%1979
Eastern KingbirdTyrannidae52024-14%1971
Eastern Wood-PeweeTyrannidae52024+75%1970
Purple MartinHirundinidae52024-79%1970
Scarlet TanagerCardinalidae52022+14%1977
Blue-winged TealAnatidae52023-30%1995
Common RavenCorvidae52023-59%1998
Blue JayCorvidae42024+25%1971
DickcisselCardinalidae42024-78%1975
Tree SwallowHirundinidae42024-56%1970
Horned LarkAlaudidae42024+457%1971

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