Lions are the second largest cat in the world, second only to tigers. Adult male lions weigh between 330-550 pounds. Their big shaggy manes are unique among cats and are said to make them look larger and more intimidating giving them a competitive advantage in the wild.
Lions are also very fast. They can run up to 50 miles an hour. However, running quickly tires them out and they can only run fast in small bursts. Lions have very small hearts compared to the size of their bodies. This may be why they prefer to spend the majority of their time resting. They sleep and rest 20 hours a day!