Rook, Bird Identification Guide
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Rook
American Crow Identification, All About Birds, Cornell Lab of Ornithology
Carrion Crow (Corvus corone) -> Rook (Corvus corone) - BirdID's Bird Guide - Nord University - Birdid
American Crow - Montana Field Guide
British crow family guide: identification, habitat and species facts
BTO Bird ID - Corvids - Crow, Rook, Raven
Differences Between an American Crow and a Common Raven (with Map, Pictures, and Sounds) - Avian Report
Rook Bird Facts Corvus Frugilegus
Corvids: Their Differences and Similarities – Spiritual Carol Blog
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