BirdAnalyst
BBS Route · Wisconsin · BCR 12

Union Twp Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 143 species recorded across 57 survey years, still active.

143Species 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 →
57Years 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
5Observers

Bird Species Found on Wisconsin Union Twp

Top 40 of 143 species by most recent count. Each links to its species trend.

Species recorded on the Union Twp 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-eyed VireoVireonidae892025+807%1969
VeeryTurdidae48202526×1970
Canada GooseAnatidae422024+190%1973
OvenbirdParulidae402025+93%1968
Blue JayCorvidae392025+17%1968
American CrowCorvidae312025-19%1968
Eastern TowheePasserellidae302025+70%1968
American RobinTurdidae292025+365%1968
Scarlet TanagerCardinalidae262025+83%1968
Black-capped ChickadeeParidae252025+154%1968
Mourning DoveColumbidae202025+74%1968
Chipping SparrowPasserellidae192025+255%1968
Eastern Wood-PeweeTyrannidae182025-2%1968
Indigo BuntingCardinalidae182025+21%1968
Common YellowthroatParulidae152025+6%1968
Chestnut-sided WarblerParulidae152025+57%1977
American RedstartParulidae152025+880%1978
Common GrackleIcteridae14202412×1977
Cedar WaxwingBombycillidae142024+108%1970
Red-breasted NuthatchSittidae14202512×1982
Great Crested FlycatcherTyrannidae132025-60%1968
Blue-winged TealAnatidae121987n/an/a
Field SparrowPasserellidae102025-22%1969
White-breasted NuthatchSittidae10202511×1973
Eastern BluebirdTurdidae102025-7%1968
White-winged CrossbillFringillidae102008+400%1977
Eastern PhoebeTyrannidae92025+320%1968
Song SparrowPasserellidae82024+171%1968
Gray CatbirdMimidae82025+78%1968
Yellow-throated VireoVireonidae72025+62%1968
American GoldfinchFringillidae62025+167%1968
Rose-breasted GrosbeakCardinalidae62025-35%1968
Wood ThrushTurdidae62025+80%1972
Common RavenCorvidae62025+300%1979
Hermit ThrushTurdidae62025+35%1977
Vesper SparrowPasserellidae52025+42%1974
Yellow WarblerParulidae52025+100%1970
Tree SwallowHirundinidae52025+214%1970
Black-and-white WarblerParulidae52025+180%1989
DickcisselCardinalidae52023+43%2021

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