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Habitat
Even though most people think of Antarctica when they think of penguins, actually only two species live on the Antarctic continent (the Adelie and the Emperor). The other species range in habitat from the islands near the Antarctic circle, to the shores of South America, South Africa, Australia, New Zealand, and the Galapagos Islands.

Some species of penguins live 75% of their lives at sea, coming to shore only to breed and molt. Migratory penguins will spend 3-5 months at sea, before coming to shore. Although they do rest on ice floes. Very few details are known about the penguin's life in the sea.

Preditors
Penguins have no large land predators, which is probably why they have little fear of people. The Yellow-eyed penguin is the exception, they are very shy and reclusive. (And also in danger of extinction. It is estimated that there are less than 10,000 left in the world.)

In the sea, penguins are preyed on by killer whales, leopard seals, sea lions, sharks and (according to one book I read) octopus (octopi?).

In Motion
Penguins are great swimmers, with speeds reaching 15 MPH. The Emperor penguin can dive to a depth of 900 feet and stay under for 20 minutes. On land the penguin is not so graceful, their short legs give them their distinctive waddle. They also get around by "tobogganing", which means they flop down on their belly and kick with their feet and flippers over the snow and ice.

Physical Characteristics
Penguins are extremely specialized birds. Totally adapted to the life they lead. Their wings have become flippers, and their feathers have become unlike the feathers of any other type of bird. The feathers are very dense, approximately 70 feathers per square inch. They are shiny, long and stiff. They are somewhat curved and overlapping (like fish scales, or the tiles on a roof). This design helps keep the penguin waterproof. The penguin also keep their feathers well oiled with frequent preening and an oil gland at the base of the tail. Once a year, after breeding, the penguins molt (that is replace the old worn out feathers with new ones). Since the penguins are not waterproof while they are molting, they do not go to sea, and do not eat, during this time. Molting can take 30 days and a penguin may lose as much as 30% of their body weight in the process.

One book mentioned that (since they spend most of their time at sea) penguins drink salt water. They have special glands that remove the salt. It is then excreted as a liquid and drips down the grooves on the sides of the penguins beak.

Cold weather (climate) penguins are well insulated with their thick blubber and feathers. In fact sometimes they become over heated (even the antarctic breeds), especially the dark feathered chicks. To cool off the penguins will pant and fluff up their feathers, to promote heat loss.

Warm climate penguins have exposed areas of pinkish skin on their faces and legs and feet. This helps them keep cool. If the weather is too hot, they will spend most of their time in underground burrows or in the sea, where the cold currents keep them cool.