The Harbor Seal (Phoca vitulina), also known as the Common Seal, is found along temperate and Arctic marine coastlines of the Northern Hemisphere. They are found in coastal waters of the northern Atlantic, Pacific Oceans, Baltic and North Seas.
They possess a unique pattern of spots, either dark on a light background or light on a dark. They vary in color from brownish-black to tan or grey; underparts are generally lighter. Harbor Seals stick to familiar resting spots or haulout sites, generally rocky areas (although ice, sand, and mud may also be used) where they are protected from adverse weather conditions and predation, near a foraging area. Males may fight over mates underwater and on land. Females bear a single pup after a nine-month gestation, which they care for alone. Pups can weigh up to 16 kg and are able to swim and dive within hours of birth. They develop quickly on their mothers' fat-rich milk and are weaned after four to six weeks.