BirdAnalyst
BBS Route · Minnesota · BCR 12

Cass Lake Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 130 species recorded across 24 survey years, still active.

130Species 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 →
24Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1980–2016Span
6Observers

Bird Species Found on Minnesota Cass Lake

Top 40 of 130 species by most recent count. Each links to its species trend.

Species recorded on the Cass Lake 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 VireoVireonidae622016+14%1982
OvenbirdParulidae602016+171%1982
Chestnut-sided WarblerParulidae242016+190%1982
VeeryTurdidae212016-3%1982
Common YellowthroatParulidae152016-16%1982
Cliff SwallowHirundinidae142011-87%1982
Least FlycatcherTyrannidae132016+287%1982
American RobinTurdidae122016-21%1982
Black-and-white WarblerParulidae112016+522%1982
Red-breasted NuthatchSittidae92016+171%1982
Rose-breasted GrosbeakCardinalidae82016+113%1982
White-throated SparrowPasserellidae72016+0%1982
Pine WarblerParulidae62016+80%1982
American RedstartParulidae62016+6%1982
Swamp SparrowPasserellidae62016+40%1988
Yellow-bellied SapsuckerPicidae52016+70%1982
Blue JayCorvidae52016-34%1982
Cedar WaxwingBombycillidae52016-39%1983
Yellow WarblerParulidae52016-30%1982
Chimney SwiftApodidae52012-33%1990
Great Crested FlycatcherTyrannidae42012-55%1982
Scarlet TanagerCardinalidae42016+10%1982
Downy WoodpeckerPicidae42006+100%1983
American GoldfinchFringillidae42016-10%1984
Mourning WarblerParulidae42016+113%1984
Hairy WoodpeckerPicidae42016+40%1987
Warbling VireoVireonidae41995+88%1985
Eastern Wood-PeweeTyrannidae32016+0%1982
American CrowCorvidae32016-29%1982
Black-throated Green WarblerParulidae3201613×1982
Black-capped ChickadeeParidae32016-67%1982
Swainson's ThrushTurdidae31995+75%1984
Canada WarblerParulidae32016-29%1984
Golden-winged WarblerParulidae32016+111%1985
Ring-necked DuckAnatidae32016+100%1992
Double-crested CormorantPhalacrocoracidae31990n/an/a
Canada GooseAnatidae32014+50%1993
Trumpeter SwanAnatidae32012+50%2006
Canada JayCorvidae32006n/an/a
Common LoonGaviidae22016+25%1984

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