Submitted by graham bowers on Tue, 14/11/2023 - 10:43

I found what I believe to be a cocoon on an alder log in one of my log-stores.

Any idea whet it may be please?

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Submitted by David Nicholls on Fri, 17/11/2023 - 14:36

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Very hard to say from this. The wood chips suggest the cavity was created and not just 'found'. Hymenopteran perhaps? Try rearing it to see!