BirdAnalyst
Species · BCR 36 · BBS 2025 Release · 1966–2024

Least Grebe In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsWetland birds

Least Grebe in Tamaulipan Brushlands has fallen sharply: down 72% on the route-weighted index since 1972.

-72%Since 1972TrendPercent 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 →
11Routes 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 →
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 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 declinecomputed 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 →

Least Grebe has fallen sharply in Tamaulipan Brushlands: down 72% on the route-weighted index since 1972.

Routes In Tamaulipan Brushlands

Routes recording Least Grebe in Tamaulipan Brushlands.
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 →
CatarinaTEXAS32004
Encinal 2TEXAS32011
ZapataTEXAS21968
RandadoTEXAS21975
San YgnacioTEXAS21967
RaymondvilleTEXAS22007
LaredoTEXAS22023
RachalTEXAS11968
EncinalTEXAS12009
George WestTEXAS12017
ProgresoTEXAS11996

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