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That’s the naturalistic fallacy. You need to do more than appeal to nature to make that argument. You have to give a reason why that nature, or at least nature in general, is superior.It's a sad day when you need to give a reason why captivity is worst than letting lions live free.
In the end, even genocide is not good or bad objectively. It depends on a value judgement, which from a rational perspective it's still a leap of faith or "fallacy".
Either you acknowledge the value of freedom for animals or you don't.
But to avoid the "naturalistic fallacy" let's perform an empirical, scientific experiment: let's keep you captive in a cage for several years, and see how you fare, and whether you find it alright afterwards. We'll also have a control group and everything of course, lest we mess up the experiment.
>Also, by the logic you're using, you can just as well say that possibly living in captivity is the lion's new nature. After all, humans are part of nature and our capturing of animals then is too.
In the lion's case, it's a nature imposed on them, so there's a difference. Just because we're all parts of nature doesn't mean we enjoy or thrive under everything that happens in nature: we wouldn't enjoy being eaten by lions or being kept captive in cages by higher sentient animals (e.g. aliens).