DESCRIPTION : These kings of the jungle can weigh between 250 and 550 pounds, depending on sex and age and can grow up to be 14 years old in the wild and over the age of 20 years old in captivity. They become capable at hunting at the age of two and are fully grown after 5 or 6 years. Male lions are distinguishable for their impressive manes, which signifies their masculinity and reflects their health.