A wide diversity of species were represented: zebra, hippopotamus, rhinoceros, antelopes, pigs, giraffes, elephants, primates, and, carnivores (Potts, 339). Some aquatic animals and other small vertebrates were presented but the antelope are most abundant in the fossils. Five to ten species are identifiable in the bones from each level. Tools were also found such as stream cobbles and other pieces of rocks that were flaked repeatedly but in a crude way. The most abundant type of artifact at each site is debitage. These flakes seamed to be used but not intentionally made to be used. Finally each site contained stone pieces of stone raw material, which exhibit no evident traces of flaking or use. Isaac has recently suggested that the first interpretations of these early archaeological sites relied on observation of modern hunter-gathers (Potts, 339). As far as it is known all hunter-gathers do their activities around a campsite or home bases. As Potts describes debris builds up in well-defined places through out the habitat leaving behind stone artifacts and animal bones in clusters. Paleolithic archaeologists have drawn an analogy between modern day hunter-gathers and the remains from humans of earlier times. The concept of home base and the activities connotes have been important in the interpretation of the earliest archaeological sites. In particular sites such as Bed one at Olduvai it is widely recognized to provide evidence for the existence of home bases during the Plio-Pleistocene. This implies that a hunter - gathering way of life has existed during ninety-nine percent of human history since the beginning of stone tool making (Potts, 340). This concept has two important aspects in paleoanthropology, one the sharing of food and two the safety offered from a protected base camp. The home base would have been in a specific location and this would allow foragers to carry food. Also members of the social group would prepare and consume food there as well as, sleep, make tools, and meet with other group members.