BirdAnalyst
Species · BCR 4 · BBS 2026 Release · 1966–2025

Sora In BCR 4

All regionsBCR 4Wetland birds

Sora in BCR 4 has declined: down 37% on the route-weighted index since 1993.

-37%Since 1993TrendPercent 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 →
6Routes 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 →

No notable trend signals for Sora in BCR 4. See the full index history below.

Routes In BCR 4

Routes recording Sora in BCR 4.
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 →
NorthwayALASKA21996
Birch LakeALASKA12012
LivengoodALASKA12017
SlanaALASKA12024
Kenny LakeALASKA12025
Hatcher PassALASKA12017

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14.