BirdAnalyst
BBS Route · Wisconsin · BCR 23

Casco Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 149 species recorded across 55 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 →
55Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
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 BlackbirdIcteridae922025-48%1970
Song SparrowPasserellidae502025+253%1970
European StarlingSturnidae472025-45%1970
American RobinTurdidae452025+103%1970
Canada GooseAnatidae432023+142%1989
Barn SwallowHirundinidae402025+80%1970
Rock PigeonColumbidae372025+26%1972
Savannah SparrowPasserellidae332025-37%1970
Cedar WaxwingBombycillidae32202512×1973
House SparrowPasseridae312025-66%1970
Chipping SparrowPasserellidae28202521×1977
Northern House WrenTroglodytidae252025+550%1970
American CrowCorvidae242025+3%1970
Indigo BuntingCardinalidae242025+657%1970
Common GrackleIcteridae182025+141%1970
Mourning DoveColumbidae172025+346%1970
KilldeerCharadriidae162025+9%1970
Pine SiskinFringillidae161988n/an/a
Wild TurkeyPhasianidae152025+200%1997
Cliff SwallowHirundinidae142025+314%1970
Red-eyed VireoVireonidae142025+525%1971
Gray CatbirdMimidae132025+288%1972
Brown-headed CowbirdIcteridae122025-22%1970
American GoldfinchFringillidae122025+113%1970
Eastern MeadowlarkIcteridae112025-85%1970
Yellow WarblerParulidae112025+540%1971
Common YellowthroatParulidae92025+575%1972
Horned LarkAlaudidae92025+314%1971
Sandhill CraneGruidae92025+400%1992
Purple MartinHirundinidae82025-76%1970
Tree SwallowHirundinidae82025-28%1970
DickcisselCardinalidae72025-71%1975
Northern CardinalCardinalidae72025+400%1977
American RedstartParulidae72025+360%1986
Blue JayCorvidae62025+50%1971
Chimney SwiftApodidae62025-41%1974
Eastern Wood-PeweeTyrannidae52025+88%1970
Scarlet TanagerCardinalidae52022+14%1977
Blue-winged TealAnatidae52023-30%1995
Red-bellied WoodpeckerPicidae52025+267%1991

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