BirdAnalyst
Species · BCR 18 · BBS 2025 Release · 1966–2024

Bronzed Cowbird In Shortgrass Prairie

All regionsShortgrass PrairieGeneralists

Bronzed Cowbird in Shortgrass Prairie has surged: up 228% on the route-weighted index since 2007.

+228%Since 2007TrendPercent 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 →
12Routes 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 →
15YearsYears 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 →

Bronzed Cowbird has surged in Shortgrass Prairie: up 228% on the route-weighted index since 2007.

Routes In Shortgrass Prairie

Routes recording Bronzed Cowbird in Shortgrass 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 →
Pine RidgeNEBRASKA22008
CircleTEXAS22019
StilesTEXAS22018
Cooley LakeNEW-MEXICO12017
HobbsNEW-MEXICO12014
San SimonNEW-MEXICO11989
PostTEXAS12019
PlainsTEXAS12019
FloydadaTEXAS12018
MentoneTEXAS12012
DoughertyTEXAS12018
PlainsTEXAS12015

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