Yeah, lions have awesome lives. Nothing like roving the world, murdering other males and eating their young, taking their females to breed and hunt for you, then inevitably getting murdered yourself by other roving males. It's a utopia!
(Also: God, "remain in balance with their ecosystem" is such a mendacious phrase. People use it all the time, as if animals have some kind of mystical gaia sense that says, "Woah, woah, woah lion, you're using too many natural resources here. Maybe just meditate today." Here's how lions "remain in balance with their ecosystem": they try to eat everything they can. Sometimes they're unsuccessful and they starve. Sometimes they're successful and cause a local shortage of prey and then they starve. Yaaaaaaaaaaay.)