Penguins are flightless birds and they can drink sea water. The Emperor Penguin is the tallest of all penguin species, reaching as tall as 120 cm (47 in) in height. Emperor penguins have white bellies, a black head, pale yellow on their chests, and bright yellow ear patches. Emperor Penguins can stay underwater for around 20 minutes at a time and often huddle together to keep warm in the cold temperatures of Antarctica.