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 counter shaded dark
and white plumage, and their wings have evolved into flippers. Most
penguins feed on krill, fish, squid and other forms of sea
life caught while swimming underwater. They spend about half of their
lives on land and half in the oceans.