In our marine toxicology work, we seek to understand how toxic a chemical is to a marine species in an effort to understand how environmental pollutants might be endangering them. We focus on damage to DNA, since this type of damage can interfere with the ability of these species to reproduce and the ability of their offspring to survive. Thus our hypothesis is that environmental contaminants are decreasing the reproductive success of marine species. We study all sorts of marine species whales, sea lions, sea turtles, fish and even alligators that are more freshwater but can wade into marine waters to feed.