BirdAnalyst
BBS Route · Connecticut · BCR 30

Warren 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 90 species recorded across 13 survey years, still active.

90Species 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 →
13Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2012–2025Span
1Observers

Bird Species Found on Connecticut Warren 2

Top 40 of 90 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 VireoVireonidae432025+0%2014
OvenbirdParulidae392025+74%2014
Gray CatbirdMimidae272025+15%2014
American RedstartParulidae272025+310%2018
Yellow WarblerParulidae242025+105%2014
Song SparrowPasserellidae232025+26%2014
American RobinTurdidae222025+4%2014
VeeryTurdidae212025+12%2014
Red-winged BlackbirdIcteridae172025+36%2014
Chipping SparrowPasserellidae172025-27%2014
Common YellowthroatParulidae162025-2%2014
Tufted TitmouseParidae162025+153%2014
American CrowCorvidae142025-27%2014
Northern House WrenTroglodytidae132025+39%2014
Mourning DoveColumbidae122025+50%2014
Cedar WaxwingBombycillidae122025+32%2014
Yellow-bellied SapsuckerPicidae122025+45%2015
Black-and-white WarblerParulidae92025+113%2015
Black-capped ChickadeeParidae92025-26%2014
Eastern PhoebeTyrannidae82025-7%2014
American GoldfinchFringillidae82025+31%2014
Chestnut-sided WarblerParulidae82025+20%2014
Northern CardinalCardinalidae72025-17%2014
Scarlet TanagerCardinalidae72025+250%2017
Pine WarblerParulidae72025-33%2014
House SparrowPasseridae72025+56%2014
Wood ThrushTurdidae72025-44%2014
Red-bellied WoodpeckerPicidae62025+75%2014
Eastern TowheePasserellidae62025-27%2014
Eastern Wood-PeweeTyrannidae52025+100%2014
White-breasted NuthatchSittidae52025+124%2014
Downy WoodpeckerPicidae42025+50%2014
Blue JayCorvidae42025-42%2014
Brown-headed CowbirdIcteridae42025-36%2014
Tree SwallowHirundinidae42024-10%2014
Eastern BluebirdTurdidae42025-30%2014
Swamp SparrowPasserellidae42025+73%2019
Warbling VireoVireonidae42025+17%2021
Wild TurkeyPhasianidae32025+0%2016
Common RavenCorvidae32025+100%2022

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