who's nest?

who's nest?

Observation - who's nest? - UK and Ireland. Description: this has been dug out and size is 6 inches deep 3 inches entrance hole and is situated in an old conifer bole which was sawn down some years ago

this has been dug out and size is
6 inches deep
3 inches entrance hole
and is situated in an old conifer bole which was sawn down some years ago