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Order: Sphenisciformes (from the greek meaning wedge form)

Penguins are a group of aquatic flightless birds that live almost exclusively in the Southern Hemisphere. The only species of penguin that is found north of the Equator is the Galápagos penguin. Penguins are highly adapted for life in the water and have countershaded dark and white plumage as well as flippers for swimming. Most penguins feed on krill, fish, squid, and other forms of sea life. Penguins have a spiny tongue and powerful jaws to grip slippery prey. They spend approximately half of their lives on land and the other half in the sea.

A male Emperor Penguin incubating an egg. Aptenodytes forsteri . 

image: wikimedia