Chernobyl Birds
The fact that birds have smaller brains (and thus lesser cognitive ability) than their counterparts living outside of the Exclusion Zone is just another example of how radiation can have an adverse effect on their health and wellbeing. Some bird species have been shown to have higher rates of albinism than others.
Large Catfish
The radioactive cooling pond at Chernobyl is home to a large number of enormous catfish. The radiation, on the other hand, hasn’t caused the catfish to explode in size. It is because there are no natural predators and a great deal of competition in the cooling pond that they have grown to such a large size. You have a monster of a fish on your hands when you combine their voracious appetite with their ability to consume virtually anything.