After waiting for over two weeks for his mate to return from the sea and relieve him of nest duty, this Adelie penguin's hunger helps him make the decision to abandon his egg in search of fish and krill in the sea. Photo taken December 12, 2002. Known populations of the Adelie penguin have dropped by 65% over the past 25 years.
A molting emperor penguin seen on January 3, 2007. (Carlie Reum/National Science Foundation)
Penguins on a massive iceberg near the Antarctic Peninsula on November 28, 2003. (Kurtis Burmeister/National Science Foundation)
South Georgia Island in the South Atlantic Ocean, seen on February 23, 2006. (Melissa Rider/National Science Foundation)
A cable protrudes from the ice wall at Explorer's Cover, New Harbor, McMurdo Sound in this photo taken on November 12, 2005. The cable was used for the Remotely Operable Micro-Environmental Observatory (ROMEO), an underwater camera. Connected to onshore equipment and linked by radio to the Internet, ROMEO allowed scientists to study benthic fauna year-round. (Steve Clabuesch/National Science Foundation)
Adelie penguins launch themselves out of the frigid water onto the ice on December 31, 2005. (Patrick Rowe/National Science Foundation)