Common seals, also known as harbor seals, are marine mammals found along the coasts of the Northern Hemisphere. They have a streamlined body, a rounded head, and distinctive spotted fur, which helps them blend into their surroundings. Common seals typically weigh between 100 to 300 pounds and can grow up to 6 feet long. These seals are known for their playful behavior and can often be seen basking on rocks or beaches. They primarily feed on fish and invertebrates, using their sensitive whiskers to detect prey in the water. Common seals are social animals, often found in groups, but they can also be solitary.