Hazel in the Gironde estuary, France
I strongly suspect the builder was human. :-)
It looks remarkably similar to a commercially available roosting pocket similar to this one here.
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In reply to Ian Chester:
Ian Chester said:It was found in our garden in the conifer hedge Paul. No reason to post anything other than to establish what bird made it. It would appear tits are getting everywhere...
Perhaps put there by a neighbour / previous householder? As Wendy has said, I wouldn't rule out the possibility of it being used as a nest if it's been there for a while.
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