BirdAnalyst
BBS Route · Massachusetts · BCR 30

Warren Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 115 species recorded across 41 survey years, no longer active.

115Species 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 →
41Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2009Span
5Observers

Bird Species Found on Massachusetts Warren

Top 40 of 115 species by most recent count. Each links to its species trend.

Species recorded on the Warren 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
American RobinTurdidae372009+4%1970
Mourning DoveColumbidae352009+162%1970
Red-winged BlackbirdIcteridae272009-20%1970
Gray CatbirdMimidae252009+37%1970
European StarlingSturnidae212009-65%1970
Chipping SparrowPasserellidae212009-19%1970
Black-capped ChickadeeParidae212009+69%1970
Northern CardinalCardinalidae21200914×1972
Tufted TitmouseParidae21200914×1973
House SparrowPasseridae202009-46%1970
Chimney SwiftApodidae182009-34%1970
Red-eyed VireoVireonidae172009-28%1970
Song SparrowPasserellidae162009-48%1970
Cedar WaxwingBombycillidae152009-43%1970
Brown-headed CowbirdIcteridae142009+40%1970
Common YellowthroatParulidae142009-47%1970
Eastern PhoebeTyrannidae132009+55%1970
American GoldfinchFringillidae112009+3%1970
Northern House WrenTroglodytidae102009-8%1970
Blue JayCorvidae92009-52%1970
American CrowCorvidae92009-4%1970
OvenbirdParulidae92009+16%1970
American RedstartParulidae92009+200%1970
White-breasted NuthatchSittidae92009+300%1971
BobolinkIcteridae82009+214%1970
House FinchFringillidae82009+157%1979
Downy WoodpeckerPicidae72009+117%1970
Common GrackleIcteridae72009-74%1970
Barn SwallowHirundinidae72009+15%1970
Wood ThrushTurdidae62009-75%1970
Eastern KingbirdTyrannidae52009-50%1970
Eastern TowheePasserellidae52009-83%1970
Warbling VireoVireonidae52009+125%1971
Yellow WarblerParulidae52009+82%1970
Pine WarblerParulidae52009+280%1980
Turkey VultureCathartidae52009+50%1992
Eastern Wood-PeweeTyrannidae42009+60%1970
Field SparrowPasserellidae42009-63%1970
Northern MockingbirdMimidae42009+367%1971
VeeryTurdidae42009-50%1970

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