Birds Britannica by Mark Cocker and Richard Mabey, Chatto & Windus, 2005 ; Watching birds by James Fisher, Penguin, 1941 ; Photograph of John Hancock (courtesy of the Natural History Society of Northumbria)
Birds Britannica by Mark Cocker and Richard Mabey, Chatto & Windus, 2005 ; Watching birds by James Fisher, Penguin, 1941 ; Photograph of John Hancock (courtesy of the Natural History Society of Northumbria)