BirdAnalyst
BBS Route · Massachusetts · BCR 30

Mansfield Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 104 species recorded across 44 survey years, still active.

104Species 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 →
44Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2025Span
7Observers

Bird Species Found on Massachusetts Mansfield

Top 40 of 104 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
American RobinTurdidae752025+128%1970
House SparrowPasseridae542025+62%1970
Chipping SparrowPasserellidae522025+276%1970
Song SparrowPasserellidae452025+190%1970
Gray CatbirdMimidae392025+300%1970
Tufted TitmouseParidae39202511×1971
Northern CardinalCardinalidae38202516×1976
Mourning DoveColumbidae282025+244%1970
European StarlingSturnidae272025-48%1970
Common GrackleIcteridae272025+35%1970
American GoldfinchFringillidae242025+464%1973
Black-capped ChickadeeParidae232025+128%1970
Carolina WrenTroglodytidae20202513×1990
Blue JayCorvidae192025-29%1970
House FinchFringillidae192025+125%1989
Red-winged BlackbirdIcteridae182025+61%1970
Chimney SwiftApodidae152025+51%1970
American CrowCorvidae152025-54%1970
Northern House WrenTroglodytidae142025+105%1970
Cedar WaxwingBombycillidae132025+163%1992
Brown-headed CowbirdIcteridae122025+194%1972
Tree SwallowHirundinidae122024+92%1971
Downy WoodpeckerPicidae112025+50%1970
Pine WarblerParulidae92025+156%1992
White-breasted NuthatchSittidae82025+333%1971
Eastern BluebirdTurdidae72025+367%1998
Rock PigeonColumbidae62025+50%1970
Barn SwallowHirundinidae62025+80%1970
OvenbirdParulidae52025-39%1970
Red-tailed HawkAccipitridae52024+167%1993
Northern MockingbirdMimidae52025+67%1974
KilldeerCharadriidae42024-13%1970
Canada GooseAnatidae42022-5%1990
Bank SwallowHirundinidae42007-23%1991
Turkey VultureCathartidae42025+233%2010
Common RavenCorvidae42025+133%2015
Eastern PhoebeTyrannidae32025+58%1970
Wood ThrushTurdidae32025-68%1970
Northern ParulaParulidae31978+33%1971
MallardAnatidae32016-69%1990

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