St. Louis Today: Their feet might be happy, but they’re also endangered. Pollution, weather and overfishing have contributed to steep declines in the populations of 12 out of 17 penguin species in the world, according to P. Dee Boersma, a scientific fellow for the Wildlife Conservation Society. Boersma presented her research in Chicago last week at the annual meeting of the American Association for the Advancement of Science. Boersma studies Magellanic penguins at a wildlife reserve in …