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@sciencebase I disturbed it during daylight rather than saw it flying. I gather they o/w as a larva. I guess it had got ready to pupate or something and it moved very little. Anyway, it's back in the shrubs now. I'll be more careful of chucking cold coffee in there in future.
@sciencebase I realise that's pretty screwy. I meant hibernate but not even sure they do that either. Maybe just dying.