How large is the world's biggest penguin? An adult emperor penguin can grow up to about 40 inches (102 cm) tall, which makes it about as tall as a six-year-old child Emperor penguins live in the coldest place on earth--Antarctica. To survive the extreme conditions, emperor penguins have a layer of feathers that are waterproof and windproof. They also have a thick layer of fat to help them stay warm. With all these layers, an adult male emperor penguin...