NATURE braves the extreme conditions of earth's southernmost continent for a close-up look at the varied "Penguins of the Antarctic." Watch mother penguins as they reunite with their mates and chicks and celebrate survival in the harsh Antarctic climate. “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