A species of pigmy opossum (_Thylamys caucæ_) lived in the woods. It is the size of a mouse, but has a longer tail. The slate-colored little animals prefer small cavities in tree-trunks for their homes, where they spend the days curled up in sleep; if disturbed they are very sluggish and may be taken in the hand, their only concern being to find a dark spot where they can snuggle up to one another and go to sleep again. At night they are more active and go on foraging expeditions for fruit, insects, and almost anything of an edible nature they can find. The camp pet at this time was a young sloth (_Cholœpus andinus_). The slow-moving little beast reminded one of a “Teddy Bear,” and when it clambered among the branches of a tree it always recalled to me Hudson’s description to the effect that he “hugged the branches as if he loved them.” Our pet had been brought in by a native hunter who had shot the mother and found the young one clinging to her long, gray hair. It was easy to handle owing to its inactivity, but occasionally it struck viciously with its front feet, each armed with two formidable claws, and also snapped suddenly in an attempt to bite, its strong teeth enabling it to inflict severe injury. It ate quantities of tender green leaves at regular intervals, but it was always necessary to first sprinkle them liberally with water and then feed them to the little creature one at a time and in quick succession. I have kept a number of sloths at various times and found that they thrived on young shoots and buds of many trees and plants, such as cacao, cabbage, lettuce, and almost any succulent vegetation. I know of no animal that appears more stupid and lifeless than a sloth. They move with great difficulty and in a sprawling posture on the rare occasions when they descend to the ground, on account of the peculiar formation of the feet; nor do they attain any great speed while moving in the tree-tops, where they always maintain an inverted position except when climbing up or down a trunk. When resting they roll up into a ball, and as a species of green alga not infrequently grows on the fur, they are very inconspicuous among the leaves and moss-covered branches of their home--at least when viewed from below. But from above they do not always escape the sharp eye of the harpy-eagle, which is their chief enemy. In spite of its lifeless appearance, it would be difficult to find a mammal more tenacious of life; in this respect it resembles the reptiles. Sloths will withstand the most frightful wounds and frequently make their escape after having been shot many times. The natives are very fond of the flesh and not infrequently capture the animals when cutting down trees in clearing land; a favorite way to kill them is by drowning, but this is a lengthy and barbarous process, as it requires a long submergence before the creatures cease struggling and life is extinct.