The Penguins have no fear of man. Mr. Darwin pleasantly relates his encounter with one of these birds on the Falkland Islands. "One day," he says, "having placed myself between a Penguin (_A. demersa_) and the water, I was much amused by the action of the bird. It was a brave bird, and, till reaching the sea, it regularly fought and drove me backwards. Nothing less than heavy blows would have stopped him. Every inch gained he kept firmly, standing close before me firm, erect, and determined, all the time rolling his head from side to side in a very odd manner, as if the powers of vision only lay in the anterior and basal part of each eye." This bird, Mr. Darwin states, is called the Jackass Penguin, from this habit, when on shore, of throwing its head backwards, and of making a loud strange noise very like the braying of an ass. They defend themselves vigorously with their beaks when an attempt is made to lay hands upon them; and when pursued, they will pretend to retreat, and return immediately, throwing themselves upon their assailant. "At other times they will look at you askance," says Pernetty, "the head inclined first on one side, then on the other, as if they were mocking you." They hold themselves upright on their feet, the body erect, in a perpendicular line with the head. In this attitude they might be taken for a party of choristers with white surplices and black gowns. Their cry strikingly resembles the braying of an ass. Navigators passing these islands of the southern seas might suppose that they were densely inhabited, for the loud roaring voices of these birds produce a noise equal to that of a crowd on a fête day. The flesh is most unpalatable, but it is frequently the only resource of ships' crews who find themselves short of provisions in these inhospitable regions. As to the eggs of most of the Palmipedes, they are said to be excellent. THE GREBES. The Grebes (_Podiceps_) have the head small, the neck somewhat elongated, the legs attached to the abdomen, the tail rudimentary, the tarsi compressed, the anterior toes united at their base by a membrane slightly lobed in its contracted extent. These birds live principally on the sea, but they inhabit fresh water by preference, feeding on small fishes, worms, mollusks, insects, and the products of aquatic vegetation. While they dive and swim admirably, they also fly with vigorous wing when pursued; but they rarely ascend into the air unless they are alarmed, or under migrating impulse, which disperses them among the interior lakes in the autumn, and compels them to select a favourable breeding-place in the spring.