Lions are considered to be the king of the jungle due to their size, strength and numbers and because they don't fear any other animal. This can be somewhat misleading since lions don't actually live in jungles.
Lions have no natural predators. Occasionally, they will come into contact with hyenas and because both animals eat the same foods, fights can take place. In the rare event a pack of hyenas can take down a lion, they will eat it. Otherwise, the two groups of animals keep their distance from one another.
Lions maintain order within the pride the way a king maintains order within the boundaries of his kingdom. Like a king, lions keep strict control on their pride and the land in which they are in control. Lions will fight to the death to protect their territory.