BirdAnalyst
BBS Route · Wisconsin · BCR 23

Merrill Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 131 species recorded across 46 survey years, still active.

131Species 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 →
46Years 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
8Observers

Bird Species Found on Wisconsin Merrill

Top 40 of 131 species by most recent count. Each links to its species trend.

Species recorded on the Merrill 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-winged BlackbirdIcteridae402025-33%1969
Common YellowthroatParulidae402025+24%1969
American RobinTurdidae362025-29%1969
Song SparrowPasserellidae302025-38%1969
Red-eyed VireoVireonidae262025+80%1969
European StarlingSturnidae252025-74%1969
American CrowCorvidae242025+59%1969
Indigo BuntingCardinalidae232025+87%1969
Cedar WaxwingBombycillidae212025+85%1969
Mourning DoveColumbidae172025+225%1972
Rose-breasted GrosbeakCardinalidae162025+3%1969
OvenbirdParulidae162025+113%1969
Least FlycatcherTyrannidae142025+21%1969
Chipping SparrowPasserellidae142025-13%1969
Yellow WarblerParulidae132025+70%1969
American GoldfinchFringillidae122025+0%1969
Black-and-white WarblerParulidae112025+229%1969
Ruffed GrousePhasianidae112002+17%1989
Common GrackleIcteridae112025-5%1973
American RedstartParulidae102025+400%1969
Northern House WrenTroglodytidae92025-17%1969
Red CrossbillFringillidae91980n/an/a
Brewer's BlackbirdIcteridae82015-52%1969
Savannah SparrowPasserellidae82025-86%1969
White-throated SparrowPasserellidae82025-11%1969
Gray CatbirdMimidae82025-7%1969
Black-capped ChickadeeParidae82025+173%1969
KilldeerCharadriidae72025-35%1969
Chimney SwiftApodidae72025+111%1970
Eastern Wood-PeweeTyrannidae72025+88%1969
VeeryTurdidae72025-49%1969
Canada GooseAnatidae72012+29%2002
Chestnut-sided WarblerParulidae62025+58%1969
Northern CardinalCardinalidae62025+50%1992
Blue JayCorvidae52025-4%1969
Eastern MeadowlarkIcteridae52025-89%1969
Eastern KingbirdTyrannidae42025+13%1969
BobolinkIcteridae42025-84%1969
Baltimore OrioleIcteridae42025+22%1969
Clay-colored SparrowPasserellidae42025-68%1969

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