Originally posted by Serial_Apologist
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Despite seeming shy and skulking they allow close approach in some locations, or don't seem to notice if you are nearby; but I never see more than two pairs here - more importantly, never hear more than two or three singing males, here or in a given area of local woods (no, still can't back get to them yet...)
In Winter they can form surprisingly big communal roosts. 10 or 20 can cram into a single nest box or loftspace sometimes, for warmth; I think the biggest recorded was 61! (Norfolk 1969).
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