Male and female (on right) Grey Seals (Halichoerus grypus) fighting on the shore, in winter, at Donna Nook Nature Reserve, on the North Sea coast of Lincolnshire, Great Britain

grey seals halichoerus grypus fighting winter shore nature reserve north sea male seal female wildlife marine mammals natural behavior east coast britain conservation animal interaction sandy beach population native species cold weather coastal habitat life landscape outdoor scene muddy terrain observation genetics territorial dispute welfare ecosystem biodiversity climate day