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

Field Sparrow In Tamaulipan Brushlands

All regionsTamaulipan BrushlandsGeneralists

Field Sparrow in Tamaulipan Brushlands has declined: down 35% on the route-weighted index since 1980.

-35%Since 1980TrendPercent 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 →
17YearsYears 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 →

No notable trend signals for Field Sparrow in Tamaulipan Brushlands. See the full index history below.

Routes In Tamaulipan Brushlands

Routes recording Field Sparrow 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 →
RaymondvilleTEXAS31980
RachalTEXAS21983
ZapataTEXAS21970
MillettTEXAS22006
La PryorTEXAS12017
HondoTEXAS12016
DilleyTEXAS12021
SejitaTEXAS12021

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