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.

Barlow, Nora ed. 1963. Darwin's ornithological notes. Bulletin of the British Museum (Natural History). Historical Series Vol. 2, No. 7, pp. 201-278. With introduction, notes and appendix by the editor.

Rook (Corvus frugilegus)

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