NATURE braves the extreme conditions of earth's southernmost continent for a close-up look at the varied "Penguins of the Antarctic." Here, male emperor penguins strut their stuff in a penguin version of the Paso Doble, courting prospective mates. “Penguins of the Antarctic” airs Sunday, April 27 at 8 p.m. (check local listings). Major support provided by Canon U.S.A. Inc., Toyota, and the Corporation for Public Broadcasting. For more information, visit http://www.pbs.org/wnet/nature/antarcticpenguins/index.html