Makes me think of how wolves were introduced into the ecosystem at Yosemite and all the vegetation started growing back and erosion improved, I think, too, b/c the wolves were eating the elk, the elk couldn't overconsume the vegetation b/c they had to stay on the move to avoid the wolves.Great story! Nanners is a particularly good-looking rabbit, I have to say, and obviously in great condition due to your care.
But I wonder about the vet you consulted and his/her shock about Nanner's survival. Rabbits are very cold-hardy and adaptable. We actually have a huge problem, from Seward to Anchorage to the Interior, with domestic rabbits gone feral. They thrive and reproduce like rabbits and ruin gardens... and that's with Alaska's long cold winters and many, many motivated predators.
Then there's Bunny Island in Japan. Really sad. Bunnies just overproduce.
We don't know Nanners' history before he showed up, but I think he lived indoors his whole life b/c he got palpably depressed as it got colder and he got dirtier outside.