Lion, the king of savanna, is a vulnerable specie. During the last 20 years the number of lions dropped by 30-50%.
Lion is a really lazy animal. It relaxes 20 hours a day and a couple of hours at night it hunts.
That's why lion feels great in captivity, where its longevity increases from 10-15 years to 20-25 years. There it does not even have to stop its royal rest.