I think it would be a very good idea if their was a mutation out there that has to do with being radioactive. Because there's all sorts of animals that have evolved in radioactive environment I think it would be an interesting idea to incorporate a mutation. If not a survivable mutation maybe a lethal mutation of something like this. And if you don't like the suggestion could you tell me why and if you have something you might want to add or suggest go ahead and tell me below

Edit 2: it's been brought to my attention that it's still not as specific due to the fact that there are multiple mutations that could happen genetically speaking which is why I said a chance at some of random mutations. Well went I online and a little bit of research before putting this up. there a few mutations that can happen like growing multiple legs/ hair lose/ mange/ boils/black or tough skin and fur/ sores/. Heightened aggression. In some species they adapt to the environment but they also get heightened aggression there aggressive.There's also lethal ones like disfiguring of the face/ mangled limbs/ very very rare cases they would have the organs on the outside. I mean there's all sorts of different mutations that can come out of radioactive areas to the point where one frog species went from bright green to completely black and color just because they needed to adapt and they became more resistant physically towards toxic materials the skin become tougher and everything. There's a species of the moth that grew a black pair of wings just a blend in. There's been cases where a dog has just gotten some boils and house lived or hair loss and there's a case where a cow has gotten a disfigured face and has died from it which is why I said what about having like an item or a man you can give to a pregnant female and it's like a very small chance of the child mutating and it's like a random mutation just pick one and then put it on the cub

Edit:What I was thinking is that it could be something like a mod or item that you can give a female who is pregnant and have a small chance of random mutation for the radioactive material and if it doesn't mutat then it could possibly kill the lioness or cause her to lose her litter and her to become infertile.