BirdAnalyst
BBS Route · Massachusetts · BCR 30

Warren 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 109 species recorded across 12 survey years, still active.

109Species 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 →
12Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2010–2025Span
2Observers

Bird Species Found on Massachusetts Warren 2

Top 40 of 109 species by most recent count. Each links to its species trend.

Species recorded on the Warren 2 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 RobinTurdidae852025+108%2012
Gray CatbirdMimidae502025+100%2012
Red-winged BlackbirdIcteridae472025+94%2012
Red-eyed VireoVireonidae362025+74%2012
Song SparrowPasserellidae342025+96%2012
OvenbirdParulidae322025+49%2012
Northern CardinalCardinalidae272025+8%2012
Common GrackleIcteridae242025+174%2012
Common YellowthroatParulidae212025+79%2012
Tufted TitmouseParidae212025+45%2012
Chipping SparrowPasserellidae172025+26%2012
Mourning DoveColumbidae162025-40%2012
European StarlingSturnidae162025+90%2012
Tree SwallowHirundinidae162025+96%2012
House SparrowPasseridae152025+68%2012
Brown-headed CowbirdIcteridae132025+131%2012
Yellow WarblerParulidae132025+50%2012
Blue JayCorvidae122025+28%2012
Cedar WaxwingBombycillidae122025-9%2012
Black-capped ChickadeeParidae122025-5%2012
House FinchFringillidae112025+633%2012
Northern House WrenTroglodytidae112025+109%2012
VeeryTurdidae112025-33%2012
Canada GooseAnatidae92025+90%2017
American GoldfinchFringillidae92025-42%2012
Wood ThrushTurdidae92025-15%2012
American CrowCorvidae82025-54%2012
Eastern Wood-PeweeTyrannidae72025+83%2012
American RedstartParulidae72025+14%2012
Chimney SwiftApodidae62025+160%2012
Eastern TowheePasserellidae62025-15%2012
Rose-breasted GrosbeakCardinalidae52025+33%2012
Warbling VireoVireonidae52025-17%2012
Yellow-throated VireoVireonidae52025+71%2018
Eastern BluebirdTurdidae52025+22%2019
Red-bellied WoodpeckerPicidae42025-6%2012
Eastern PhoebeTyrannidae42025-13%2012
Indigo BuntingCardinalidae42024-36%2012
Scarlet TanagerCardinalidae42025-59%2012
Blue-winged WarblerParulidae42025+40%2012

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