BirdAnalyst
Species · BCR 5 · BBS 2025 Release · 1966–2024

Caspian Tern In Northern Pacific Rainforest

All regionsNorthern Pacific RainforestWetland birds

Caspian Tern in Northern Pacific Rainforest has surged: up 117% on the route-weighted index since 1975.

+117%Since 1975
23Routes In Region
50Years

Notable Signals

long arc increasecomputed index

Caspian Tern has surged in Northern Pacific Rainforest: up 117% on the route-weighted index since 1975.

Forecast

If the recent trend holds, Caspian Tern in Northern Pacific Rainforest is projected to rise about 636% by 2029 — from 0.05 in 2024 to a central estimate of 0.39 (95% range 0.03–0.75). A 5-year backtest shows a typical error of ±215.2%, with 80% of held-out values landing inside the 95% band.

+636%Change by 2029
0.39Projected 2029 index
0.03–0.7595% range
±215.2%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
20250.370.010.74
20260.380.010.74
20270.380.020.74
20280.390.020.75
20290.390.030.75

Routes In Northern Pacific Rainforest

Routes recording Caspian Tern in Northern Pacific Rainforest.
HoneydewCALIFORNIA42011
GlasgowOREGON42021
Port AngelesWASHINGTON42023
McchordWASHINGTON41998
WedderburnOREGON32004
Bunker HillWASHINGTON32000
MukilteoWASHINGTON32023
Warm Beach 2WASHINGTON32024
YakutatALASKA22023
Fish RockCALIFORNIA22013
SvensenOREGON21990
Warm BeachWASHINGTON22017
South ElmaWASHINGTON21990
DeceptionWASHINGTON21997
MccloudCALIFORNIA11980
Bodega BayCALIFORNIA12019
YrekaCALIFORNIA12006
Hazel CampOREGON12013
Nicolai Mtn.OREGON12014
TaholahWASHINGTON12017
IlwacoWASHINGTON12024
RaymondWASHINGTON12018
Vashon Is.WASHINGTON12023

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