They follow the turtles toward the beach, where the laying of eggs is to take place, surprise them on the sand, and in order to devour them at their ease, adroitly turn them on their backs; and as they turn many more than they can devour in one night, the Indians often profit by their cunning. The jaguar pursues the turtle quite into the water, and when not very deep, digs up the eggs; they, with the alligator, the heron, and the gallinago vulture ore the most formidable enemies the little turtles have. Humboldt justly remarks, When we reflect on the difficulty that the naturalist finds in getting out the body of the turtle, without separating the upper and the under shell, we cannot enough admire the suppleness of the jaguar's paw, which empties the double armor of the _arraus_, as if the adhering parts of the muscles had been cut by a surgical instrument. The rivers of South America swarm with alligators, and these wage perpetual war with the jaguars. It is said, that when the jaguar surprises the alligator asleep on the hot sandbank, he attacks him in a vulnerable part under the tail, and often kills him, but let the alligator only get his antagonist into the water, and the tables are turned, for the jaguar is held under the water until he is drowned. The onset of the jaguar is always made from behind, partaking of the stealthy treacherous character of his tribe; if a herd of animals, or a party of men be passing, it is the last that is always the object of his attack. When he has made choice of his victim, he springs upon the neck, and placing one paw upon the back of the head, while he seizes the muzzle with the other twists the head round with a sudden jerk which dislocates the spine, and deprives it instantaneously of life: sometimes, especially when satiated with food, he is indolent and cowardly, skulking in the gloomiest depths of the forest, and scared by the most trifling causes, but when urged by the cravings of hunger, the largest quadrupeds, and man himself, are attacked with fury and success. Mr. Darwin has given an interesting account of the habits of the jaguar: the wooded banks of the great South American rivers appear to be their favorite haunt, but south of the Plata they frequent the reeds bordering the lakes; wherever they are they seem to require water. They are particularly abundant on the isles of the Payana, their common prey being the carpincho, so that it is generally said, that where carpinchos are plentiful, there is little fear of the jaguar; possibly, however, a jaguar which has tasted human flesh, may afterwards become dainty, and like the lions of South Africa, and the tigers of India, acquire the dreadful character of maneaters, from preferring that food to all others.