BirdAnalyst
BBS Route · Connecticut · BCR 30

Warren 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 89 species recorded across 12 survey years, still active.

89Species 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 →
2012–2024Span
1Observers

Bird Species Found on Connecticut Warren 2

Top 40 of 89 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
Red-eyed VireoVireonidae512024+6%2014
Song SparrowPasserellidae292024+12%2014
VeeryTurdidae272024+19%2014
American RobinTurdidae272024+6%2014
Common YellowthroatParulidae262024+0%2014
OvenbirdParulidae232024+34%2014
Gray CatbirdMimidae222024+13%2014
White-breasted NuthatchSittidae162024+112%2014
Mourning DoveColumbidae142024+36%2014
American CrowCorvidae142024-20%2014
Northern CardinalCardinalidae132024+17%2014
Chipping SparrowPasserellidae122024-36%2014
Northern House WrenTroglodytidae122024+45%2014
Tufted TitmouseParidae122024+106%2014
Wood ThrushTurdidae122024-44%2014
American GoldfinchFringillidae112024+50%2014
Black-capped ChickadeeParidae112024-17%2014
Yellow WarblerParulidae102024-5%2014
Yellow-bellied SapsuckerPicidae102024+35%2015
Eastern PhoebeTyrannidae92024-11%2014
Red-winged BlackbirdIcteridae92024+12%2014
Eastern TowheePasserellidae92024-41%2014
Eastern Wood-PeweeTyrannidae82024+60%2014
House SparrowPasseridae82024+38%2014
Downy WoodpeckerPicidae72024+60%2014
Cedar WaxwingBombycillidae72024+0%2014
Yellow-throated VireoVireonidae72023+20%2014
Carolina WrenTroglodytidae72024+600%2023
Barn SwallowHirundinidae62024+33%2015
Red-bellied WoodpeckerPicidae52024+25%2014
Scarlet TanagerCardinalidae52024+175%2017
Pine WarblerParulidae52024-38%2014
Swamp SparrowPasserellidae52024+109%2019
Yellow-billed CuckooCuculidae52021+400%2019
Blue JayCorvidae42024-46%2014
Brown-headed CowbirdIcteridae42024-43%2014
Common GrackleIcteridae42024+67%2016
Tree SwallowHirundinidae42024-10%2014
Chestnut-sided WarblerParulidae42024+0%2014
American RedstartParulidae42024+100%2018

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