A nestbox of typical style and dimensions, situated on the wall outside the back door of my rural property in Co. Armagh, was occupied by Blue Tits Cyanistes caeruleus in spring 2020. Activity at the nestbox was high, with unusually frequent provisioning visits. On 23rd May, I checked the box and discovered two broods of young Blue Tits, in two separate nest cups (plate 170); the nestlings in the

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