BirdAnalyst
Species · BCR 37 · BBS 2025 Release · 1966–2024

unid Black-crowned / Yellow-crowned Night Heron In Gulf Coastal Prairie

All regionsGulf Coastal PrairieWetland birds

unid Black-crowned / Yellow-crowned Night Heron in Gulf Coastal Prairie has risen sharply: up 51% on the route-weighted index since 2000.

+51%Since 2000TrendPercent 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 →
8Routes In RegionSurvey routesHow many standard-protocol BBS routes contributed counts. More routes means a steadier, better-sampled index; very thin coverage is suppressed.Full methodology →
12YearsYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →

Notable SignalsNotable 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 →

unid Black-crowned / Yellow-crowned Night Heron has risen sharply in Gulf Coastal Prairie: up 51% on the route-weighted index since 2000.

Routes In Gulf Coastal Prairie

Routes recording unid Black-crowned / Yellow-crowned Night Heron in Gulf Coastal Prairie.
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 →
Ville PlatteLOUISIANA52016
DanburyTEXAS52017
KaplanLOUISIANA42000
KatyTEXAS32015
MauriceLOUISIANA22023
Port AcresTEXAS22009
Lag AtascosaTEXAS11999
L. Atascosa NwrTEXAS11998

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