Rook, Bird Identification Guide
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ID Guide to British crows [Corvids] – British Naturalists' Association
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457 Rook Bird Stock Photos, High-Res Pictures, and Images - Getty Images

American Crow Identification, All About Birds, Cornell Lab of Ornithology
Rook - eBird

Identify crows Wildlife Watch
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Rook Bird Facts (Corvus frugilegus)

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por adulto (o preço varia de acordo com o tamanho do grupo)