In the bodies of reptiles, some industrial by-products cause elevated hormonal activity  Hormones govern the development of certain body parts, and in reptiles abnormal development of these parts occurs only with elevated hormonal activity  Recently, several alligators with the telltale developmental abnormalities were discovered in a swamp
So, apparently, industrial by-products have entered the swamp' s ecosystem
fails to say whether reptiles other than alligators were examined for the same developmental abnormalities that were discovered in the alligators