BirdAnalyst
Species · Louisiana · BBS 2026 Release · 1966–2025

Cave Swallow Population Trend in Louisiana

All statesAerial insectivores

Cave Swallow in Louisiana has surged: up 20× on the route-weighted index since 2013.

20×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 →
17Routes 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 →
14YearsYears 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 20× 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
Woodlawn2420182011
Esther2020252019
De Ridder620192014
Rayville 2620242024
Evelyn420222021
Ltl Chenier220252023
Kaplan220232014
Hackberry 2220252025
Morgan City220132012
Longstreet220222022
Vinton 2120252025
Ramah120232015
Ltl Chenier 2120112011
Hackberry120122012
Brousville120252015
Forked Island120252014

Cave Swallow Population Trend in Other States

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Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.