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Elephant seals are the largest seals on earth. Male northern elephant seals attain a mature length of thirteen to sixteen feet, and may weigh between 4,500 and 6,000 pounds. Males of the southern species are larger and heavier than their northern cousins, and may reach a length of twenty feet, and weigh as much as 8,700 pounds. Females of both species are smaller. Their weight varies according to certain conditions. Adult elephant seals are gray in color, which is more pronounced in the females. They have no fur, but have areas covered with short, firm hairs.