Mutant Frogs

Who says living near toxic waste is safe???!!! Check out the frogs in this picture. What on earth is wrong with their legs!?! Amphibians are easy species to study for mutations due to environmental changes. They reproduce quickly and with many offspring per mating. All they need is a little water (their eggs dry out without it) and they are good to go. Can you thing of any other creatures that might be good to study mutations due to changes in the environment?