Penguins are a group of aquatic, flightless birds living
almost exclusively in the southern hemisphere, especially
in Antarctica. Highly adapted for life in the water, penguins
have countershaded dark and white plumage, and their wings
have become flippers. Most penguins feed on krill, fish, squid,
and other forms of sealife caught while swimming underwater.
They spend about half of their life on land and half in the