Though a clumsy-looking creature, it can run and jump with great activity. It makes a noise somewhat like the grunting of a young pig. It lives upon fruits and tender plants, going out from its hole to forage at night, but generally remaining concealed during the daytime. When alarmed it readily takes to the water, and dives and swims remarkably well. Bates describes a tame cutea, or an agouti, which he found feeding in the neighbourhood of a village, nibbling the fallen fruits of the inaja-palm. On his trying to catch it, instead of betaking itself, as he thought it would, to the thicket, it ran on to the house of its owners, which was at a distance of about two hundred yards. The paca and agouti belong to the peculiar family of the rodent order confined to South America, and which connects the Rodentia to the Pachydermata--the order to which the elephant, horse, and hog belong. The fossil toxodon resembled the Rodentia in its dentition, and, at the same time, was nearly related to the elephant. These facts make it probable that these animals are living representatives of a group which existed at a distant epoch of the world's history, and which possessed a structure partaking of the character of the two great orders--Rodentia and Pachydermata--now so widely distinct in the majority of forms. THE ARMADILLO. In days gone by, huge monsters--their backs covered with bony armour-- ten feet and upwards in length, some perhaps of the bulk of the rhinoceros, crawled along the plains of South America. They have become creatures of the past, and their places have been taken by others of a similarly curious formation, of which even the giant armadillo, when compared to them, is a mere pigmy. These creatures abound in all parts of the continent, from Paraguay to Venezuela; but, incased as they are in coats of complete armour, and running so quickly, and so rapidly digging into the earth, they can rarely be overtaken by the hunter. The armadillo (Dasypus) belongs to the order of Edentata. The armour, which covers the whole body, consists of a triangular plate on the top of the head, a large buckler over the shoulders, and a similar one covering the haunches; while between the solid portions a series of transverse bands intervene in such a manner as to allow the creature to move its body in a variety of postures. The tail is likewise covered with a series of calcareous rings. It can, in consequence of this peculiar conformation of its covering, roll itself up, like the hedgehog, into a ball, and thus present a solid surface, impervious to the attacks of birds of prey or small quadrupeds. The part over the shell is covered with short hairs, which appear between the joints of the armour. It has a pointed snout, long ears, thick, short limbs, and powerful claws. With these claws it burrows with extraordinary rapidity, and can inflict severe wounds.