What is only slightly lamer than you posting this featherweight reverie is my actually responding to it ....

I feel dirty ....

Some areas which are sealed off from humans due to radiological threats, like the Zone of Alienation around Chernobyl, have become home to burgeoning plant and animal populations including near record size wolves and feral hogs. But that's only indirectly due to radiation: the radiation keeps humans away, allowing the wildlife to thrive.

Edited to add: You can see a very similar principle in effect in other no-go zones for humans, like the Demilitarized Zone between North and South Korea. 1,000,000 landmines tell humans to keep out, but the wildlife just keeps on growing. Although to less of an extent than the Zone of Alienation, because animals aren't immune to landmines.

The wildlife in Chernobyl's exclusion zone is considered "larger than average" for instance. This is probably due to twenty years of nature's general law of "biggest breeds best" being unchallenged by humans. However since the lack of humans is due to the radiation, ine could perhaps say...