Pied Wagtails: Buy One Get One Free!

There's often a large roost of Pied Wagtails where I work (Morrisons in Beverley) and when I left this evening I made a point of looking for them. Looking carefully along the roof I could see lots of little bodies cuddled together above the entrance - probably about 70 birds that were visible. Presumably the supermarket remains warmer than many other places, with staff working through the night, creating an ideal roosting place in cold weather. Fortunately none of the management seems to have noticed, so currently no one has decided to move the birds along.