BirdAnalyst
BBS Route · Minnesota · BCR 12

Cromwell Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 146 species recorded across 48 survey years, still active.

146Species 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 →
48Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2025Span
3Observers

Bird Species Found on Minnesota Cromwell

Top 40 of 146 species by most recent count. Each links to its species trend.

Species recorded on the Cromwell 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
OvenbirdParulidae442025+42%1969
Alder FlycatcherTyrannidae402025+38%1969
Nashville WarblerParulidae282025+13%1969
Common YellowthroatParulidae272025-24%1969
VeeryTurdidae262025-45%1969
Red-eyed VireoVireonidae232025+3%1969
Chestnut-sided WarblerParulidae232025-2%1969
White-throated SparrowPasserellidae182025-49%1969
Golden-winged WarblerParulidae162025+150%1969
Mourning WarblerParulidae152025-17%1969
American CrowCorvidae142025-3%1969
Red-winged BlackbirdIcteridae142025-66%1969
American RobinTurdidae142025-35%1969
Yellow-bellied SapsuckerPicidae142025+375%1974
Sedge WrenTroglodytidae132025+4%1969
Least FlycatcherTyrannidae122025-62%1969
Blue JayCorvidae122025+65%1969
Gray CatbirdMimidae122025+24%1969
Hermit ThrushTurdidae112025+200%1973
Song SparrowPasserellidae102025-53%1969
Rose-breasted GrosbeakCardinalidae102025-42%1969
Cedar WaxwingBombycillidae102025+375%1971
Black-capped ChickadeeParidae102025+300%1971
Eastern Wood-PeweeTyrannidae92025+58%1969
Red-breasted NuthatchSittidae92025+325%1972
Canada WarblerParulidae92025+467%1976
Black-billed CuckooCuculidae82025+22%1969
Swamp SparrowPasserellidae82025-26%1969
Black-and-white WarblerParulidae82025+240%1969
Mourning DoveColumbidae72025+300%1971
American GoldfinchFringillidae72025+46%1969
Chipping SparrowPasserellidae72025-18%1969
Wilson's SnipeScolopacidae72025-60%1971
Yellow WarblerParulidae62025-42%1969
Common RavenCorvidae62025+38%1979
Trumpeter SwanAnatidae62025+78%2012
Eastern KingbirdTyrannidae52025-31%1969
American RedstartParulidae52025+0%1969
Wood ThrushTurdidae52025-50%1977
Pine SiskinFringillidae52000+400%1990

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