There are 32 different types of seals in the world of which the elephant seal is the largest. These animals can weigh upwards of 2 tons. The smallest type of seal, the Galapagos fur seal, has an average weight of only 65 pounds.
Harbor seals, sometimes referred to as common seals, have one of the largest ranges of all seals. They are often found on rocky or sandy beaches in large numbers. Gray seals are another type, typically averaging around 600 pounds when fully grown. As of 2014, their numbers are increasing in such a way that some fisherman are calling for a culling of the population since the seals eat a lot of the fish the fishermen catch and are known to spread parasites.