Mummichog, a type of fish, evolved so they can survive in highly toxic water.

Mummichog goes by a few different names, like killifish or mud minnows. Recently, it was discovered by National Geographic that some of these fish had adapted enough to survive in rivers that were 8,000 times more toxic than the initial lethal dose. Surviving nuclear pollution? Check.

In general, these fish are extremely adaptable. They can live in both fresh and saltwater and are in total control of their genome. They have the ability to turn genes on and off depending on their environment, according to NewScientist.