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

Sandwich Tern In Gulf Coastal Prairie

All regionsGulf Coastal PrairieWetland birds

Sandwich Tern in Gulf Coastal Prairie has surged: up 469% on the route-weighted index since 2010.

+469%Since 2010TrendPercent 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 →
4Routes 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 →

Sandwich Tern has surged in Gulf Coastal Prairie: up 469% on the route-weighted index since 2010.

Routes In Gulf Coastal Prairie

Routes recording Sandwich Tern 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 →
Oyster LakeTEXAS152024
Padre Island PaisTEXAS122015
IndianolaTEXAS22004
Grand IsleLOUISIANA12018

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