The Gentoo Penguin ( /ˈdʒɛntuː/ jen-too), Pygoscelis papua, is easily recognized by the wide white stripe extending like a bonnet across the top of its head and its bright orange-red bill. The gentoo penguin has pale whitish-pink webbed feet and a fairly long tail - the most prominent tail of all penguins. Chicks have grey backs with white fronts. As the Gentoo penguin waddles along on land, its tail sticks out behind, sweeping from side to side, hence the scientific name Pygoscelis, which means ‘rump-tailed’. Adult Gentoos reach a height of 51 to 90 cm (20–36 in), making them the third largest species of penguin after the two giant species, the Emperor Penguin and the King Penguin. The Gentoo penguin calls in a variety of ways, but the most frequently heard is a loud trumpeting which is emitted with its head thrown back.