Penguins spend most of their lives in the oceans. They live on the land only when laying their eggs and raising their young. Penguins are sociable animals and live and play together. They nest in colonies called rookeries. Some of these rookeries have as many as million birds.
Penguins propel themselves through the water with flying movements of their flippers.
While many birds are lightweight so they can fly, penguins are heavy so they can swim and dive for food. A penguins wings are paddle like flippers. Their legs and webbed feet are used as rudders, for steering.