Pied Wagtails roosting inside greenhouses

T H E P U R P O S E of this paper is to bring together data on the communal roosting of Pied Wagtails Motacilla alba yarrellü inside commercial glasshouses. These data are from three sources: references in the British literature (three), personal observations at a Somerset site, and the results of enquiry letters published in two horticultural trade papers. Observations on Pied Wagtails nesting...