Last night I researched communal winter roosting behaviour of Wrens: Birds may travel as far as 2km to established roost site. Resident male bird may be on the door only letting females and few persistent males in. 96 birds recorded in one roost. Roost sites are well insulated passerine nests (house martin nests are popular), nest boxes, holes in trees, walls and under roofs. The birds leave the roost about half a hour before sunrise. Sunrise was at 8.22am this morning and sure enough at 7.50am they all started to pile out, I counted 29 leaving, don't know what happened to the other 5! About 30 birds roosted again tonight.
[from John Gale]
[from John Gale]
