For a long-range weapon the Yahgan used the sling. He saw the Ona Indians with their bows and arrows. The Onas also used the bolas, which are the favorite weapons of the Patagonian Indians. With the Ona Indians the bow and the bolas were used with great success in killing the fleet-footed guanaco. Now the Yahgan, as said, found the guanaco in his own proper country as well as when he went visiting the Onas on the borderland, and he must have fully appreciated all that the Onas could do with their bolas and bows. Some of the Yahgans even learned to use these Ona weapons, but they never adopted them. The reason is not far to seek. The Yahgan sling had a much greater range. The missionaries tell about Yahgans killing birds afloat at a distance of two hundred yards. To hit any wild fowl at that distance with a rifle would be called right good shooting. The guanaco was knocked down and stunned by heavy round pebbles at ranges up to one hundred yards. Why, then, did not the Ona adopt the sling? The answer is an interesting one for the student of anthropology. The home of the Ona was on the prairies of Tierra del Fuego, where round pebbles are not to be found, but material for bows and arrows is abundant. The Ona could not burden himself with pebbles for a sling when journeying across these prairies. On the other hand, the Yahgan lived on the beaches, where rounded pebbles were forever at hand, and when he travelled it was not afoot, as the Ona did, but in a first-class canoe, where he could carry as many pebbles as he wanted. The Yahgan sling was made of a piece of raw hide, to which were attached strings of braided sinew that always ended in fancifully wrought knots.