A young Grey Seal pup (Halichoerus grypus) on the shore in winter, at Donna Nook Nature Reserve, on the North Sea coast of Lincolnshire, Great Britain.

grey seal pup winter donna nook nature reserve north sea lincolnshire marine life wildlife coastal resting animal behavior mammal natural habitat young environmental conservation shoreline care thermoregulation instincts british colony aquatic mammals observation ecosystem grassland cold climate adaptation ecological balance photogenic animals baby enthusiasts nurturing environment welfare beauty anatomy