BirdAnalyst
BBS Route · Louisiana · BCR 25

Zwolle Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 94 species recorded across 21 survey years, still active.

94Species 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 →
21Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1998–2023Span
3Observers

Bird Species Found on Louisiana Zwolle

Top 40 of 94 species by most recent count. Each links to its species trend.

Species recorded on the Zwolle 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
Northern CardinalCardinalidae692023-22%2000
Cliff SwallowHirundinidae412016+883%2000
Carolina WrenTroglodytidae362023+2%2000
American CrowCorvidae342023-44%2000
Blue JayCorvidae282023+1%2000
Yellow-breasted ChatIcteriidae282023-20%2000
Northern MockingbirdMimidae252023+38%2000
Indigo BuntingCardinalidae232023+28%2000
White-eyed VireoVireonidae192023-14%2000
Red-bellied WoodpeckerPicidae162023+256%2000
Tufted TitmouseParidae162023+8%2000
Mourning DoveColumbidae152023+82%2000
Hooded WarblerParulidae152023+36%2000
Common GrackleIcteridae112023+27%2001
Pine WarblerParulidae112023-62%2000
Brown-headed CowbirdIcteridae82023-27%2000
Orchard OrioleIcteridae82023+0%2000
Red-eyed VireoVireonidae82023-26%2000
Prairie WarblerParulidae72023+33%2000
Eastern BluebirdTurdidae72023-33%2000
Fish CrowCorvidae72023+138%2002
Carolina ChickadeeParidae62023-3%2000
Blue GrosbeakCardinalidae52023+36%2000
Summer TanagerCardinalidae52023-59%2000
Painted BuntingCardinalidae52017+200%2003
Black VultureCathartidae52022+133%2005
Double-crested CormorantPhalacrocoracidae42023+280%2000
Yellow-billed CuckooCuculidae42023+100%2000
Eastern Wood-PeweeTyrannidae42023-50%2000
European StarlingSturnidae42023+46%2000
Kentucky WarblerParulidae42009-25%2000
American RobinTurdidae42017+29%2001
Eurasian Collared-DoveColumbidae42023-25%2006
Great Crested FlycatcherTyrannidae32022-64%2000
MallardAnatidae22012+100%1998
Red-headed WoodpeckerPicidae22022-43%2001
Chimney SwiftApodidae22023-73%2000
Barn SwallowHirundinidae22023+15%2000
Common YellowthroatParulidae22023-27%2000
Brown ThrasherMimidae22023+0%2001

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