BirdAnalyst
BBS Route · Vermont · BCR 14

Marlboro Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 110 species recorded across 31 survey years, still active.

110Species 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 →
31Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1966–2025Span
3Observers

Bird Species Found on Vermont Marlboro

Top 40 of 110 species by most recent count. Each links to its species trend.

Species recorded on the Marlboro 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
Red-eyed VireoVireonidae732025+169%1968
OvenbirdParulidae522025+74%1968
Chipping SparrowPasserellidae332025+197%1968
Black-capped ChickadeeParidae282025+75%1968
American RobinTurdidae282025+0%1968
Tufted TitmouseParidae262025+417%1990
Song SparrowPasserellidae222025+12%1968
Common YellowthroatParulidae222025+200%1968
Blue JayCorvidae182025-30%1968
Pine WarblerParulidae162025+238%2016
Yellow-bellied SapsuckerPicidae122025+388%1968
American RedstartParulidae122025+143%1968
Chestnut-sided WarblerParulidae112025+30%1968
Blackburnian WarblerParulidae112025+575%1978
American GoldfinchFringillidae102025+46%1968
Brown CreeperCerthiidae102025+214%1991
Eastern PhoebeTyrannidae92025-14%1968
Gray CatbirdMimidae92025+22%1968
VeeryTurdidae92025-52%1968
Least FlycatcherTyrannidae82025-33%1968
Red-winged BlackbirdIcteridae82025-58%1968
Black-throated Green WarblerParulidae72025+164%1968
Hairy WoodpeckerPicidae62025+300%1969
Downy WoodpeckerPicidae62025-13%1968
American CrowCorvidae62025-25%1968
Indigo BuntingCardinalidae62025+114%1969
Black-and-white WarblerParulidae62025+320%1968
Yellow WarblerParulidae62025-58%1968
House SparrowPasseridae62025+150%1968
Chimney SwiftApodidae52025+0%1968
Eastern Wood-PeweeTyrannidae52025-19%1968
Scarlet TanagerCardinalidae52025-22%1968
Wood ThrushTurdidae52025-81%1968
Northern CardinalCardinalidae52025+120%1987
Wood DuckAnatidae52025+57%1995
Barn SwallowHirundinidae42025-32%1968
Cedar WaxwingBombycillidae42025+283%1968
Winter WrenTroglodytidae42025+340%1968
Mourning DoveColumbidae42025+383%1969
Black-throated Blue WarblerParulidae42025+433%1969

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