DNA evidence recently confirmed the existence of a “pizzly bear,” the offspring of a polar bear and a grizzly bear. Scientists hypothesize that some polar bears are staying on mainland because of the warming climate, so polar bears are encountering grizzlies more often than in the past. Pizzly bears may be less fit than either polar bears or grizzlies, so some people are advocating that they be killed. Make an argument for or against this strategy. If human actions are contributing to the breeding behavior, do we have an ethical obligation to intervene? Do you think polar bears have a better chance at avoiding extinction if humans eliminate their hybrid offspring? Would evidence that polar bears and grizzlies had interbred in the past change your answers?