Chernobyl Birds
Birds are reported to have smaller brains (and hence lower cognitive ability) than their counterparts outside of the Exclusion Zone, as another illustration of the impacts of radiation on animals. Albinism has been seen in larger numbers in some bird species.
Large Catfish
Many gigantic catfish live in Chernobyl’s radioactive cooling pond. However, the radiation hasn’t caused the catfish to grow enormously. They’re huge because there aren’t any natural predators and there’s a lot of competition in the cooling pond. When you add in the fact that they’ll eat just about anything, you’ve got yourself a monster of a fish.