BirdAnalyst
BBS Route · Connecticut · BCR 30

Warren Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 126 species recorded across 40 survey years, no longer active.

126Species 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 →
40Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1972–2011Span
2Observers

Bird Species Found on Connecticut Warren

Top 40 of 126 species by most recent count. Each links to its species trend.

Species recorded on the Warren 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
VeeryTurdidae1592011+462%1974
Gray CatbirdMimidae1372011+456%1974
Cedar WaxwingBombycillidae132201113×1974
Red-eyed VireoVireonidae1282011+505%1974
American GoldfinchFringillidae121201111×1974
Red-winged BlackbirdIcteridae1202011+108%1974
American RobinTurdidae1162011+200%1974
Song SparrowPasserellidae802011+129%1974
Chipping SparrowPasserellidae772011+570%1974
Yellow WarblerParulidae722011+585%1974
Common YellowthroatParulidae682011+217%1974
Northern CardinalCardinalidae642011+662%1974
American CrowCorvidae622011+178%1974
OvenbirdParulidae592011+134%1974
Black-capped ChickadeeParidae582011+860%1974
Tufted TitmouseParidae53201119×1974
Wood ThrushTurdidae442011+47%1974
Swamp SparrowPasserellidae342011+529%1974
Mourning DoveColumbidae292011+63%1974
Chestnut-sided WarblerParulidae292011+57%1974
American RedstartParulidae282011+492%1974
Common GrackleIcteridae262011+53%1974
Black-and-white WarblerParulidae252011+133%1974
Yellow-bellied SapsuckerPicidae24201112×1977
Downy WoodpeckerPicidae202011+236%1974
Blue JayCorvidae192011+14%1974
Black-throated Green WarblerParulidae192011+650%1975
House FinchFringillidae19201111×1980
Eastern PhoebeTyrannidae172011+53%1974
Eastern TowheePasserellidae172011-15%1974
Eastern Wood-PeweeTyrannidae152011+77%1974
European StarlingSturnidae152011-37%1974
Scarlet TanagerCardinalidae142011+17%1974
Eastern KingbirdTyrannidae132011+171%1974
Tree SwallowHirundinidae132011+522%1975
House SparrowPasseridae132011+48%1974
Pine SiskinFringillidae121988n/an/a
Wood DuckAnatidae11201112×1975
Hairy WoodpeckerPicidae102011+56%1975
Northern House WrenTroglodytidae92010-68%1974

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