We had supposed that the presence of a wheat-field surrounded by primeval forest had led to an increase in the number of small mammals indigenous to the region, but this assumption proved right in so far as squirrels only were concerned. A granary had been built in the centre of the clearing, which was of considerable extent; bundles of grain were piled in it from floor to roof. Squirrels of three species came from the woods, and ensconcing themselves in the structure feasted on the wheat. They ran the entire distance between the forest and the house on the ground, taking advantage, however, of any logs or branches that littered the place. They were especially plentiful in the early morning and just before sundown. If one crept cautiously to the border of the field he was sure to see dark little forms scamper over the ground and disappear in the storehouse. The animals were very tame at first and did not leave their shelter until one was but a few yards away; then they appeared on all sides and ran quickly to the protecting woods. Later they posted a sentinel or remained on the alert, for no sooner did we reach one side of the clearing than all the squirrels hurried away on the opposite side, being careful to keep the granary between themselves and us. There were many stray dogs in the neighborhood; they pursued the squirrels while making their pilgrimage across the open space, and devoured any they succeeded in catching.
There were also other marauders that exacted a heavy toll in grain from the farmer. Yellow-throated woodpeckers (_Melanerpes flavigularis_) and green and yellow jays (_Xanthoura yucas_) were always about and frequently came to grief in our traps set for small rodents.
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.