Grey seal pup (Halichoerus grypus) calling on a sandy beach. The grey seal gives birth to a single pup after a gestation of just under a year. A pup is nursed for up to two months before becoming independent. The grey seal lives in large groups in coastal waters in the North Atlantic Ocean. It feeds almost exclusively on fish. Photographed in December, at the mouth of the Humber estuary, in Lincolnshire, UK.