Only sad thing is that island fauna is basically gone for good.
Not really true. That's what I thought until I was called back for reservist training. Many of the restricted military training areas feature swathes and pockets of wild vegetation (and accompanying insects) that make me feel like I'm in an entirely different country. I suspect most of these have been left the way they are since time immemorial? So there are native faunae are probably still present in those areas, just not publicly accessible. That said, there are also many nature reserves. Look at a map and you'll see a lot of greenery still, like diver-hloc mentioned.