BirdAnalyst
BBS Route · Massachusetts · BCR 30

Mansfield Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 103 species recorded across 43 survey years, still active.

103Species 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 →
43Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2024Span
7Observers

Bird Species Found on Massachusetts Mansfield

Top 40 of 103 species by most recent count. Each links to its species trend.

Species recorded on the Mansfield 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
European StarlingSturnidae1282024-45%1970
American RobinTurdidae1132024+154%1970
Common GrackleIcteridae522024+35%1970
Song SparrowPasserellidae522024+202%1970
Chipping SparrowPasserellidae452024+298%1970
House SparrowPasseridae452024+78%1970
Northern CardinalCardinalidae36202416×1976
Gray CatbirdMimidae312024+235%1970
Tufted TitmouseParidae22202412×1971
American GoldfinchFringillidae212024+518%1973
Blue JayCorvidae202024-28%1970
Red-winged BlackbirdIcteridae192024+96%1970
House FinchFringillidae192024+131%1989
Carolina WrenTroglodytidae18202412×1990
Mourning DoveColumbidae172024+222%1970
Downy WoodpeckerPicidae122024+36%1970
Tree SwallowHirundinidae122024+92%1971
Brown-headed CowbirdIcteridae112024+156%1972
Black-capped ChickadeeParidae112024+113%1970
Chimney SwiftApodidae102024+89%1970
Northern House WrenTroglodytidae102024+110%1970
Northern Rough-winged SwallowHirundinidae102024-32%1995
Rock PigeonColumbidae92024+43%1970
American CrowCorvidae82024-56%1970
White-breasted NuthatchSittidae72024+383%1971
Eastern PhoebeTyrannidae52024+58%1970
Barn SwallowHirundinidae52024+120%1970
Red-tailed HawkAccipitridae52024+167%1993
Yellow WarblerParulidae52024+150%1978
Cedar WaxwingBombycillidae52024+13%1992
Eastern BluebirdTurdidae52024+200%1998
KilldeerCharadriidae42024-13%1970
Eastern KingbirdTyrannidae42024+0%1971
Canada GooseAnatidae42022-5%1990
Northern MockingbirdMimidae42024+33%1974
Bank SwallowHirundinidae42007-23%1991
Northern ParulaParulidae31978+33%1971
MallardAnatidae32016-69%1990
Pine WarblerParulidae32024+144%1992
Common RavenCorvidae32018+200%2011

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