1. Penguins breed only on land and lay eggs.
2. Penguins are birds, but they cannot fly. However, they are expert at swimming.
3. Penguins have no biological defenses against germs that thrive in conditions other than cold ones. This is the reason why so many of them die in zoos.
4. In case of penguins, it is the male who takes care of the egg after the female lays it.
5. A penguin can hold its breath for six minutes underwater.
6. In order to move quickly on ice, penguins fall on their bellies and, using their feet, push themselves across the ice.
7. A penguin fluffs out its feathers, away from the body, to cool itself.
8. Penguins have insulating layers on their body, consisting of tightly packed feathers, air, skin and blubber, which help them keep warm.
9. Penguins can drink salt water.
