In May 2020, a brood of five Wrens Troglodytes troglodytes was raised in a nest inside an old Barn Swallow Hirundo rustica nest at Bramley, Hampshire. The Swallow’s nest was attached to the underside of the ridge beam, 4 m above the ground, within the apex of a doorless gable-roofed shed. On 20th May, when the chicks were about a week old, I noticed an adult Wren pecking at s

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