BirdAnalyst
Species · BCR 15 · BBS 2025 Release · 1966–2024

Northern Pygmy-Owl In Sierra Nevada

All regionsSierra NevadaGeneralists

Northern Pygmy-Owl in Sierra Nevada has fallen sharply: down 74% on the route-weighted index since 1972.

-74%Since 1972
33Routes In Region
50Years

Notable Signals

long arc declinecomputed index

Northern Pygmy-Owl has fallen sharply in Sierra Nevada: down 74% on the route-weighted index since 1972.

Forecast

If the recent trend holds, Northern Pygmy-Owl in Sierra Nevada is projected to rise about 72% by 2029 — from 0.05 in 2024 to a central estimate of 0.09 (95% range 0.00–0.42). A 5-year backtest shows a typical error of ±120.3%, with 100% of held-out values landing inside the 95% band.

+72%Change by 2029
0.09Projected 2029 index
0.00–0.4295% range
±120.3%Backtest error
19682029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.100.000.44
20260.100.000.43
20270.100.000.43
20280.100.000.43
20290.090.000.42

Routes In Sierra Nevada

Routes recording Northern Pygmy-Owl in Sierra Nevada.
Bass LakeCALIFORNIA82017
DownievilleCALIFORNIA22007
Forest HillCALIFORNIA22022
Lassen ParkCALIFORNIA11981
Eagle LakeCALIFORNIA12018
WestvilleCALIFORNIA12012
Cottage SpgsCALIFORNIA11968
DardanelleCALIFORNIA12015
JohnsvilleCALIFORNIA12017
WoodfordsCALIFORNIA12014
LumberyardCALIFORNIA12014
Greenhorn MtCALIFORNIA11997
Silver CityCALIFORNIA12009
Kings CanyonCALIFORNIA11983
Tuolumne GroveCALIFORNIA11999
Butte MeadowCALIFORNIA11996
GeneseeCALIFORNIA12018
RivertonCALIFORNIA12023
Hat CreekCALIFORNIA12015
LakeshoreCALIFORNIA12001
Chaos CraterCALIFORNIA12016
PaxtonCALIFORNIA12009
Meadow ValleyCALIFORNIA12012
Little TruckeeCALIFORNIA12017
Pollock PinesCALIFORNIA12024

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