Reports on the movements of some commoner summer migrants at British Bird observatories in 1951

As already mentioned, these reports are confined to the spring migration. The expression " Bird/Days," as used last year, represents the sum of the birds recorded each day, and as individuals may stay for more than one day it does not necessarily represent the number of different individuals seen. YELLOW WAGTAIL. THE spring passage of the Yellow Wagtail {Motacillaflavaflavissima), began on April 2nd...