Thanks, my bad with the greater/less than reference, I mixed up mi2 and km2 even though I thought I was watching out for that. Call it the same order of magnitude as California. Nothing like Hong Kong densities (6000+/km2).

Yosemite national park has loads of grizzly bears. Also a few million visitors per year to spot the grizzlies and sometimes get killed by them. [http://www.yellowstonepark.com/things-to-do/wildlife/bears/]

I wouldn't bet money on a tiger living there either, but there really aren't many humans walking around most of the DMZ.