Crows, Jays and Magpies Oregon Department of Fish & Wildlife
ODFW Recreation Report: Northwest Zone
Birds Oregon Department of Fish & Wildlife
Crows - Birds Connect Seattle
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SoundsWild Radio Program Alaska, Alaska Department of Fish and Game
Notes from the Field: The Jays — Central Oregon LandWatch
Birdwatching in Oregon — Tetrapod Zoology
Birds Oregon Department of Fish & Wildlife
Similar Species to Black-billed Magpie, All About Birds, Cornell Lab of Ornithology
ODFW Recreation Report: Northwest Zone
Common Raven - Montana Field Guide