After working so hard to bring the pinnipeds back from extinction, closing the beach and access road was an easy decision, said John Dell’Osso, the head of interpretation and resource education at Point Reyes. “They’re at a critical time: the pups have been born there, they’re nursing. We’re not going to disrupt that process.”
One of my favorite examples of this happening is the wildlife that's currently flourishing in the demilitarized zone between the two Koreas. I've even seen a few articles over the years about attempts to make that area an official wildlife refuge, though I don't know where those attempts currently stand.
Unfortunately, nature's ability to be prolific and to fill gaps and take advantage of opportunities can also be a problem, as those very attributes are what leads to invasive species.