Fig. 1From: Rapid increase of the grey seal (Halichoerus grypus) breeding stock at HelgolandGrey seal breeding sites in the North Sea and map of Helgoland; May Isle of May, Fas Fast Castle, Far Farne Islands, Don Donna Nook, Bla Blakeney Point, Hor Horsey, Dut Dutch Wadden Sea, Hel Helgoland, Amr AmrumBack to article page