Extinct and living penguin comparison. Computer illustration comparing the heights of extinct species of penguin (left four) to that of modern penguins (right four). From left to right: Waimanu sp., Perudyptes sp., Palaeeudyptes klekowskii, Icadyptes sp., emperor penguin (Aptenodytes forsteri), king penguin (Aptenodytes patagonicus), Humboldt penguin (Spheniscus humboldti), Galapagos penguin (Spheniscus mendiculus). The distance between each horizontal line is half a metre. Reaching up to around 122 cm tall, the Emperor penguin is the tallest and heaviest of all living penguin species. However, the extinct P. klekowskii was taller, reaching over 1.5 metres.