Primary areas where hunting and gathering was practiced included the savanna areas, the deciduous forests of the Brazilian and Guiana highlands, and the pampas. Typical strategies were the hunting of deer and guanaco with the bow and bolas, the gathering of wild seeds, roots, and other plants, fishing done with the bow, and on the coast, shellfish gathering. Shelters were sometimes caves; otherwise windbreaks made of skins were used. The camps were occupied only as long as food was locally available. Due to the meager cultural inventory, plus the added difficulty of site location in areas now densely vegetated, most site data is limited to tools of chipped stone, bone, and shell. The largest social groups were the bands of guanaco hunters in the pampas where the availability of game permitted groups in excess of 100 people. Elsewhere the low carrying capacity of the tropical forest environment limited population. The tropical forest pattern featured seasonal camps along the rivers with a rainy season dispersal of smaller groups who moved out into the savanna grasslands for collecting purposes.