Rooks breeding in full swing around March

Rooks, these very common and very social members of the crow family, are busy building in traditional rookeries. During one of the mildest winters on record, some enthusiastic birds in my neck of the woods were repairing nests in early February. Many are now busily building or are well underway with that stage of their reproductive cycle.

Rook (Corvus frugilegus)

Rook

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PDF) Distribution and trend of breeding population of Rooks (Corvus frugilegus L. 1758) in Osijek