I have noticed as the years go by that the Pied Wagtail as I know it (not white as is the re-direction in wikipedia) are to be found more and more in large car-parks in UK. This is even more evident to me during the winter when they can be observed paddling about at night. It amazes me how they exist and what are they living on? Do they only sleep when the public eventually leave? Where do they roost? etc.
Non of the above are given as behaviour traits in the main file (on white wagtails)!
I would like to hear more.
