it's good for wild animals to live in their ----habitat or -

it's good for wild animals to live in their _natural___habitat or _natural ___reserves.(nature)
自然保护区preserve
natural reserves
protection zone
natural preservation areas
in its natural habitat：在它的自然栖息地
natural ['nætʃərəl] adj.自然的；不做作的；天生的；物质的
n.白痴；自然的事情；[音]本位音