Sheffield - Wawings

Why do Waxwings always appear near Supermarkets? The answer is rather simple...the supermarket planners and designers always plant trees that have small berries that Waxwings eat. That got me thinking, do ASDA's etc do this on purpose to attract birders into the car park where they might pop in to spend some cash? What ever the motive (and perhaps its' just the planning permission) it's excellant. With that in mind I stopped by Sheefield, Handsworth ASDA to look for the Waxwings on my way to work today and was treated to about 60 flying around close to the edge of the car park. I wonder if the masses of Wawings will return to the Ikea depot in Doncaster as they did last year?