On 26th March in Salcey Forest, Northamptonshire, I came across a Eurasian Treecreeper Certhia familiaris building a nest. The site was about 3 m up in an old Oak Quercus robur and behind loose bark, as is usual for this species. I watched for some time as it came in with short grass stems or small slivers of bark. These visits were about four minutes apart and on one occasion when it was absent,
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