THE PACA. [Illustration: PACA.] The Paca inhabits similar localities to the former. It may be recognized by the development of its hair, which is of a tawny-brown color, very long, and falling on each side of the body in long locks. The Paca is gentle and timid, and allows itself to be led about by those who feed and tend it; but if a stranger attempts to take liberties with it, it kicks viciously, or ejects its saliva over him. Its food is similar to that of Sheep; and its wool is very fine, elastic and long. THE VICUNA. The Vicuna is the smallest species of the Llama genus. It is the same size as a Sheep, and strongly resembles the Llama, only that its shape is more elegant. Its legs, which are longer in proportion to the body, are more slender and better formed; its head is shorter and its forehead wider. Its eyes are large, intelligent and mild; its throat is of a yellowish color, while the remainder of its body is brown and white. The rich fleece of this animal surpasses in fineness and softness any other wool with which we are acquainted. In order to obtain possession of the skin the American hunters pursue them even over the steepest summits of the Andes, when, by driving, they force them into pens, composed of tightly stretched cords, covered with rags of various colors, which frighten and prevent the prey attempting to escape. One of these battues sometimes produces from five hundred to a thousand skins. THE MUSK DEER. Although it belongs to the Deer family, the little Musk Deer is often classified with this group because it is without horns, and resembles the Camel family in its teeth and other characteristics. This is a graceful little animal, about the size of a half-grown Fawn of our common Deer. Its tail is very short, and it is covered with hair so coarse and so brittle that it is almost like bristles, but what especially distinguishes it, is its pouch filled with the substance so well known in medicine and perfumery under the name of musk. The Musk Deer is a native of the mountainous region between Siberia, China and Thibet. THE HORNED RUMINANTS. The family of Common Ruminants form a natural group comprehending the greatest number of Ruminants. The feature which distinguishes the animals composing it, not only from the Camel family, but also from all the other Ruminants, is the existence of two horns on the forehead of the male, and sometimes on the female. The structure of these horns presents various differences, and has caused the division of this large and important family into three tribes, namely, Ruminants with hairy and permanent horns, hollow-horned Ruminants and Ruminants which shed their horns. RUMINANTS WITH HAIRY AND PERMANENT HORNS. [Illustration: GIRAFFE.] This tribe consists of a single genus, that of the Giraffe, which has also but one species.