I’ve read a number of post-nuclear-war novels in my day, and I did always wonder if radiation would create the mutations imagined by the authors of those books.
In case anyone is wondering about the possibility of genetic mutations after a nuclear war, I submit to you these photos of flowers growing near the Fukushima Nuclear Reactor in Japan, which leaked radiation after the 2011 tsunami.
After the 1986 Chernobyl I don’t remember seeing anything about the effects of radiation on the wild animals there, although there are a few creepy videos. This one looks like a headless moose:
In this video, biologist Timothy Mousseau has been studying the flora and fauna around Chernobyl and he is finding the radiation is still causing mutations and declines in animal populations. A few animals, however, are returning in greater numbers than expected.