There are three species of penguin: Gentoo (_Pygoscelis papua_), King (_Aptenodytes patagonica_), and Rockhopper (_Eudyptes Chrysolophus_). The Gentoo is a brightly marked bird with black head and neck, black back and white belly, yellow legs, and a white patch over each eye that gives it a curiously inane expression. It is the most shy of the penguins, and easily takes fright if rapidly approached. By dropping on its breast and using both feet and flippers it can travel at considerable speed and can dodge cleverly. It nests in tussock grass. The King is larger than the Gentoo, and has very bright markings about the neck and upper part of the breast. It nests in tussock grass, but keeps nearer to the sea edge than the Gentoo. The Rockhopper is less common than either of the others. It is smaller than the Gentoo and resembles it somewhat in appearance except that the feet are of a more browny yellow, the patch over the eye is lacking, and it has a tuft of yellow and black feathers. Occasional Ringed and Adelie penguins were noticed, but they are stragglers and not commonly seen on the island. Sea-elephants are common on all the beaches of South Georgia during the summer months, and are found also throughout the winter. They lie on the beaches or in wallows amongst the clumps of tussock grass. The smell from them is unpleasant and unmistakable. The bulls, except in the rutting season, usually remain apart from the cows, which collect, together with their young, into harems numbering from fifteen to fifty. The flippers, though short, are wonderfully flexible, and have curious little rudimentary fingers with which they scratch themselves in what is, at times, a ludicrously human way. They are fond of heaping sand upon themselves. When approached they make a curious windy roaring noise, and they may often be heard trumpeting from their wallows. Wilkins, in crossing the island, saw a sea-elephant track which led the whole way over. It was in soft snow and was unmistakable. Many other tracks went for a mile or so inland, but turned and came back to the beach from which they started, and only one was found to cross all the way. Weddell Seals come ashore in numbers, and also occasional sea-leopards.