Steller sea lions, in Kenai Fjords National Park, Alaska. Recently removed from the endangered species list in 2013, this species can be distinguished from the California sea lion by being much larger and lighter in color. Male Steller sea lions can grow up to 11 feet long and weigh up to 2,500 pounds! Females tend to be around 8 feet long and weigh up to 600 pounds when fully grown.