Original: Adult Gentoos reach a height of 51 to 90 cm (20 â "36 in), making them the largest penguins outside of the two giant species, the Emperor Penguin and the King Penguin.
Simplified: They are the largest penguins of the stiff-tailed family, which also makes them the largest penguin outside of the two giant penguins, the Emperor Penguin and the King Penguin.