Known as the only truly social cats, lions live a nomadic lifestyle in groups called prides, with a pack mentality that is usually led by the females.
Lions have golden yellow fur, and the adult male lions have shaggy manes that range in color from blond to reddish to black. The color appears to depend on a lions age, genetics and hormone levels.
Male lions grow up to 10 feet (3 meters) in length and usually weigh around 330 to 550 pounds (150 to 250 kilograms), while female lions are smaller, growing up to 9 feet (2.7 m) in length and weighing between 265 to 395 pounds (120 to 180 kg), according to the National Zoo. A lion's tail adds another 2 to 3 feet to their length (0.6 to 1 m). Adult lions stand about 3.5 to 4 feet high at their shoulders. (Asiatic lions are slightly smaller than African lions)