If it be thought interesting that a tree-climbing cat like the panther should flourish on the treeless plains of Patagonia, then it is remarkable that two kinds of the colored man's choicest game, the 'possum, should thrive in the same locality. In regions where there never was a tree, and never will be one naturally, the 'possum, with its prehensile tail dragging uselessly behind it, lives as comfortably, and makes just as good a roast, as ever it did where the pawpaws grow. That it has lived thus for ages on the treeless mesa no one need doubt; but when by chance one is transported from the plain to a region of trees, to the valley of the Rio Negro, for instance, the old tree-climbing instinct is found as strong as ever. A mother 'possum that had ten young ones as large as rats, was once taken from her nest to a plantation with trees, and straightway, without any hesitation, she climbed nimbly up, carrying her family with her in the usual fashion--clinging all over her back and sides. Nor had the use of her tail been forgotten. So much for the ordinary 'possum. There is another sort found that is no doubt indigenous, and it is of a kind to make the eyes of a colored brother bulge with astonishment, for it is at maturity the size of a small meadow mole. There are bushes on the desert large enough to serve these little fellows as trees, and they are, therefore, able to follow their instinctive desire to climb and hang head down by the tail, but the spectacle of one of the little 'possum mothers climbing about a desert bush with her tiny young clinging to her is one of the most interesting sights in nature. Another animal that is at least in one respect allied to the 'possum is the coypu. It might, perhaps, be called an aquatic 'possum because of its hairless tail and its habit of carrying its young on its back. The naturalists, however, say it is more like the beaver than any other North American beast, and it certainly has a remarkably beautiful pelage. Its flesh is very good to eat, but it is chiefly hunted for the fur. The feature of this animal, however, that at once attracts the attention of a stranger is the location of the nipples of the mother on her back instead of on her breast and belly, as in ordinary mammals. When seen swimming about with her young on her back, as is her custom, the nipples are found above the water line extending in a row from shoulder to hip, where the young can nurse as they are carried along. Of the weasels, one kind is described as much larger than those in the United States. They travel in packs like wolves when hunting, and are said to have the most malignant and devilish faces of any beast of the desert. All birds and rodents that get within their grasp are torn to pieces in savage fashion.