Emperor penguins are the largest penguins on Earth. Each adult is over a meter tall, and can weigh up to 40 kilograms.
For many months each year, emperors live near the sea in large groups called colonies. However, in May, the weather gets colder and ice covers large areas of ocean. Each colony moves many kilometers from the water. There, each mother penguin lays just one egg. Then all the hungry mothers must walk back to the ocean to find food. The father penguins put their eggs on top of their feet, under a special piece of skin called the brood pouch.