The woods as we proceeded appeared full of life. Birds flitted among the boughs, and monkeys of all sorts sprang here and there, chattering and hooting as we passed. Soon after this we emerged from the wood and entered a beautiful prairie--a natural clearing covered with grass or low shrubs and flowers. As yet we had fallen in with no inhabitants. "Oh, but see!" exclaimed Leo. "There are some huts ahead. Shall we go and pay the people a visit?" The boys ran on. I thought Senhor Silva would have called them back, but he allowed them to proceed. At all events, he knew that if the huts were inhabited, the people were likely to prove friendly. The boys stopped before the seeming huts, and began to examine them. We saw them walking round and round, and they then finally climbed to the top of one of them. After apparently satisfying their curiosity, they came back towards us. "They are not huts," exclaimed Natty, "but curious mounds, three or four times as high as we are." "What do you say to those mounds or clay-built domes being the houses of ants, and built entirely by themselves?" said Senhor Silva. As we approached we saw a dozen or more such mounds, scattered about at short distances from each other. Having got to a secure distance from the last, two of our bearers put down their loads, and advancing towards it with the poles they carried, began to attack it with heavy blows, knocking off one of the small turrets on the side. Instantly a white ant was seen to appear through the opening thus made, apparently surveying the damage done. Immediately afterwards, hundreds of other ants came to the spot, each carrying a small lump of clay, with which they began to repair the damage; and even for the short time we remained, they had made some progress. We could discover, however, no outlet or opening in the mound; nor, except at the hole made by our bearers, were any ants seen. We, however, could not remain to watch the progress of the work. Just as we were going, one of our bearers, much to my regret, commenced a still more furious attack on the citadel, exposing the whole centre to view, when it appeared crowded with thousands and tens of thousands--so it seemed--of ants, who issued forth with pincers stretched out, evidently intending to attack us. David caught up one of the ants to examine it; but we were all too glad hurriedly to make our escape. We found the creature, on examining it, to be a quarter of an inch in length, with a flat hard head, terminating in a pair of sharp horizontal pincers, something like the claws of a crab.