BirdAnalyst
Species · Louisiana · BBS 2025 Release · 1966–2024

Cave Swallow Population Trend in Louisiana

All statesAerial insectivores

Cave Swallow in Louisiana has surged: up 21× on the route-weighted index since 2013.

21×Since 2013TrendPercent 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 →
15Routes In StateSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
13YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable Cave Swallow Trends in LouisianaNotable signalsLong-arc shifts the engine flags automatically — sustained declines or increases large enough to stand out from year-to-year noise.Full methodology →

long arc increasecomputed indexTrend sourceWhether the figure is our own computed route-weighted index or an official USGS modeled estimate. The current build labels every trend as computed.Full methodology →

Cave Swallow has surged in Louisiana: up 21× on the route-weighted index since 2013.

Cave Swallow Survey Routes in Louisiana

Routes recording Cave Swallow in Louisiana.
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 →
Richard5120242016
Esther3620242019
Forked Island3020192014
Woodlawn2420182011
Ltl Chenier1820232023
De Ridder620192014
Rayville 2620242024
Evelyn420222021
Brousville220232015
Kaplan220232014
Morgan City220132012
Longstreet220222022
Ramah120232015
Ltl Chenier 2120112011
Hackberry120122012

Cave Swallow Population Trend in Other States

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Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.