Read the text and answer the following question.

Penguin is aquatic, flightless bird. Most of their species live in cold climates area. They have adapted to live in cold climates. Penguins have to keep body temperatures high to remain active. They have thick skin and lots of fat (blubber) under their skin to keep warm in cold weather. They also huddle together with their friends to keep warm. Emperor penguins have developed a social behavior that when it gets cold, they huddle together in groups that may comprise several thousand penguins. The dark colored feathers of a penguin's back surface absorb heat from the sun. It also keeps them to warm up too. Penguins tightly packed feathers overlap to provide waterproofing and warmth. They coat their feathers with oil from a gland near the tail to increase impermeability. 

From the text we know that ...