A foraging Emperor penguin preens on snow-covered sea ice around the base of the active volcano Mount Erebus, near McMurdo Station, the largest U.S. Science base in Antarctica, December 9, 2006. REUTERS/Deborah Zabarenko

Emperor penguins are seen in Dumont d’Urville, Antarctica April 10, 2012. Counting emperor penguins in their icy Antarctic habitat was not easy until researchers used new technology to map the birds from space, and they received a pleasant penguin surprise for their efforts. Using satellite mapping with resolution high enough to distinguish ice shadows from penguin poo, an international team has carried out what they say is an unprecedented penguin census from the heavens over the past three years. Picture taken April 10, 2012. REUTERS/Martin Passingham (ANTARCTICA – Tags: ANIMALS ENVIRONMENT)

An emperor penguin colony near Halley Bay in Antarctica in an undated satellite image courtesy of DigitalGlobe. Using high-resolution satellite images to study each of the 44 emperor penguin colonies around the coastline of Antarctica, experts said on Friday they put the total emperor penguin population at 595,000, or roughly double previous estimates of 270,000 to 350,000. REUTERS/British Antarctic Survey/Handout

Emperor penguins are seen in Dumont d’Urville, Antarctica April 10, 2012. Counting emperor penguins in their icy Antarctic habitat was not easy until researchers used new technology to map the birds from space, and they received a pleasant penguin surprise for their efforts. Using satellite mapping with resolution high enough to distinguish ice shadows from penguin poo, an international team has carried out what they say is an unprecedented penguin census from the heavens over the past three years. Picture taken April 10, 2012. REUTERS/Martin Passingham (ANTARCTICA – Tags: ANIMALS ENVIRONMENT)

Emperor penguins on the Brunt Ice Shelf in Antarctica in an undated photo courtesy of the British Antarctic Survey. Using high-resolution satellite images to study each of the 44 emperor penguin colonies around the coastline of Antarctica, experts said on Friday they put the total emperor penguin population at 595,000, or roughly double previous estimates of 270,000 to 350,000. REUTERS/British Antarctic Survey/Handout

An Emperor penguin is seen close to its herd in Dumont d’Urville, Antarctica April 10, 2012. Counting emperor penguins in their icy Antarctic habitat was not easy until researchers used new technology to map the birds from space, and they received a pleasant penguin surprise for their efforts. Using satellite mapping with resolution high enough to distinguish ice shadows from penguin poo, an international team has carried out what they say is an unprecedented penguin census from the heavens over the past three years. Picture taken April 10, 2012. REUTERS/Martin Passingham (ANTARCTICA – Tags: ANIMALS ENVIRONMENT)

An emperor penguin on the Brunt Ice Shelf in Antarctica in an undated photo courtesy of the British Antarctic Survey. REUTERS/British Antarctic Survey/Handout