Mute Swans NPR's Van Williamson reports on the controversy that an overabundance of mute swans is causing on the Maryland side of the Chesapeake Bay. The swans are a non-native species, and environmental groups argue that they pose a serious threat to the Chesapeake's ecosystem. Animal rights groups convinced a federal judge to postpone a state program to kill several hundred of the birds. Mexico's Fox -- NPR's Gerry Hadden looks at the successes and failures of Mexico's president, Vicente Fox. His popularity is floundering at a time of a poor economy and continuing human rights abuses in Mexico.