BirdAnalyst
BBS Route · Massachusetts · BCR 30

Brockton Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 100 species recorded across 45 survey years, still active.

100Species 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 →
45Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2019Span
5Observers

Bird Species Found on Massachusetts Brockton

Top 40 of 100 species by most recent count. Each links to its species trend.

Species recorded on the Brockton 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 RobinTurdidae1642019-12%1969
Chipping SparrowPasserellidae1112019+618%1969
Northern CardinalCardinalidae87201917×1972
Tufted TitmouseParidae85201929×1973
Gray CatbirdMimidae752019+125%1969
Black-capped ChickadeeParidae712019+80%1969
American GoldfinchFringillidae69201914×1969
Red-winged BlackbirdIcteridae482019+36%1969
Song SparrowPasserellidae472019+292%1969
House SparrowPasseridae472019+10%1969
Northern House WrenTroglodytidae382019+130%1969
American CrowCorvidae332019+70%1969
House FinchFringillidae29201911×1983
Cedar WaxwingBombycillidae182019+813%1973
Red-bellied WoodpeckerPicidae182019+933%2003
Common GrackleIcteridae172019-61%1969
Blue JayCorvidae152019-78%1969
Yellow WarblerParulidae142019+580%1969
Mourning DoveColumbidae132019+6%1969
Common YellowthroatParulidae122019+50%1969
Great Crested FlycatcherTyrannidae112019+12%1969
Baltimore OrioleIcteridae112019-24%1969
White-breasted NuthatchSittidae112019+657%1969
Tree SwallowHirundinidae102019+69%1969
Wild TurkeyPhasianidae102019+0%2016
Eastern PhoebeTyrannidae92019+113%1969
Brown-headed CowbirdIcteridae82019+407%1972
OvenbirdParulidae82019+118%1969
Downy WoodpeckerPicidae72019+357%1971
European StarlingSturnidae72019-91%1969
Barn SwallowHirundinidae72019+36%1969
Eastern TowheePasserellidae62019-88%1969
Scarlet TanagerCardinalidae62017+14%1969
Red-eyed VireoVireonidae62019+200%1969
Purple FinchFringillidae62015+50%1975
Pine WarblerParulidae6201916×1996
Chimney SwiftApodidae52019-54%1969
Great Blue HeronArdeidae52019+100%1977
Ruby-throated HummingbirdTrochilidae52019+250%2009
Double-crested CormorantPhalacrocoracidae42018-64%1992

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