An Emperor penguin dives through a hole into the water below the McMurdo Sound sea ice.
A braying Magellanic penguin from the colony at Punta Tombo, Argentina.
At Jerry Kooyman and Paul Ponganis' field camp at Cape Washington, Antarctica, curious emperor penguins approach.
A male penguins' voice reveals how good a dad he will be, a new study suggests. Here, Adelie penguins breed and raise their chicks in large groups.
Penguins are usually associated with Antarctica, but they also live in temperate areas of South America, New Zealand and Australia.
A newly hatched chinstrap penguin at Moody Gardens aquarium in Texas.
A flock of gentoo penguins at the Tennessee Aquarium in Chattanooga puts on a show. At heights of almost 3 feet (1 meter), gentoos are the third-largest penguin species in the world. Gentoos build nests out of round, smooth stones, which are highly prized by females. To curry favor with a potential mate, male gentoos sometimes present "gifts" of these coveted rocks.
Emperor penguins are the largest and tallest living penguin species.
Emperor penguin jumping out of an ice hole.
Emperor Penguins in the ice.
African penguins take a sidewalk stroll. These two-foot-tall birds are also known as "jackass penguins" because of their loud, donkey-like calls. They nest in burrows along southern Africa's coastal waters, laying two eggs that are cared for by both mom and dad. One major African penguin colony is right near Cape Town, South Africa, at Boulders Beach. There, penguins rub elbows with tourists and swimmers.
Three gentoo penguins line up at Gamage Point, Antarctica. Gentoos stand about 22 inches (56 centimeters) tall and weigh about 12 pounds (6 kilograms). Adults are marked by a white strip spanning the top of the head like a bonnet, but babies are grey-and-white balls of fuzz.
An emperor penguin incubates an egg.