This photo shows an adult emperor penguin with a baby at an Antarctic breeding colony. Based on a study of a colony of these aquatic flightless birds at Terre Adelie, Antarctica, scientists say the species could be pushed to the brink of extinction by the end of this century due to the melting of sea ice caused by global climate change. Emperor penguins are the largest species of penguin. Emperor penguins breed on Antarctic sea ice and dive from the sea ice to feed on krill, fish and squid.[Xinhua/Reuters]