The little penguin is the smallest species of penguin. It grows to an average of 33 cm (13 in) in height and 43 cm (17 in) in length, though specific measurements vary by subspecies.
The king penguin is the second largest species of penguin, smaller, but somewhat similar in appearance to the emperor penguin. There are two subspecies: Patagonicus and Halli. Patagonicus is found in the South Atlantic and Halli in the South Indian Ocean.
The emperor penguin is the tallest and heaviest of all living penguin species and is endemic to Antarctica. The male and female are similar in plumage and size.
The Galápagos penguin lives in the Galápagos Islands, Ecuador. It is the only penguin found north of the equator. The Galápagos penguin is one of the banded penguins, the other species of which live mostly on the coasts of Africa and mainland South America.