BirdAnalyst
Species · BCR 2 · BBS 2025 Release · 1966–2024

Merlin In BCR 2

All regionsBCR 2Generalists

Merlin in BCR 2 has fallen sharply: down 59% on the route-weighted index since 1999.

-59%Since 1999TrendPercent 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 →
9Routes 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 →
16YearsYears 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 →

Merlin has fallen sharply in BCR 2: down 59% on the route-weighted index since 1999.

Routes In BCR 2

Routes recording Merlin in BCR 2.
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 →
Togiak RiverALASKA42004
Katmai N.P.ALASKA12013
ChiniakALASKA12022
DillinghamALASKA12001
King SalmonALASKA12019
St. Mary'SALASKA11999
TellerALASKA11994
Kanektok RivALASKA12004
KotzebueALASKA12001

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