The last decade has witnessed a heated debate over the age and the character of the earliest occupation of Europe. This paper addresses two aspects of the debate, one dealing with the chronology of occupation, which is put to use in the second issue, an exploration of the behaviour of the earliest occupants of Europe. The review of the debate on chronology concludes that a short chronology applies to Europe north of the large mountain chains of the Alps and the Pyrenees, where the earliest traces of a human presence date back to about half a million years ago. In this phased-colonisation model, the Mediterranean, and especially Spain, saw an earlier occupation, starting around the end of the Lower Pleistocene. The archaeological record of these first Europeans suggests that from the first presence in northern Europe onwards, regular hunting of large game was common practice among Middle Pleistocene hominids. By situating this archaeological evidence in the context of findings from a range of other disciplines I develop a behavioural scenario which suggests that, at its latest by the Middle Pleistocene, increased forms of social cooperation, exchange of information within larger groups and in general forms of behaviour based on a "release from proximity" had become a standard ingredient of the hominid behavioural repertoire.

In this paper, we compare cannibalism in chimpanzees, modern humans, and in archaeological cases with cannibalism inferred from evidence from the Early Pleistocene assemblage of level TD6 of Gran Dolina (Sierra de Atapuerca, Spain). The cannibalism documented in level TD6 mainly involves the consumption of infants and other immature individuals. The human induced modifications on Homo antecessor and deer remains suggest that butchering processes were similar for both taxa, and the remains were discarded on the living floor in the same way. This finding implies that a group of hominins that used the Gran Dolina cave periodically hunted and consumed individuals from another group. However, the age distribution of the cannibalized hominins in the TD6 assemblage is not consistent with that from other cases of exo-cannibalism by human/hominin groups. Instead, it is similar to the age profiles seen in cannibalism associated with intergroup aggression in chimpanzees. For this reason, we use an analogy with chimpanzees to propose that the TD6 hominins mounted low-risk attacks on members of other groups to defend access to resources within their own territories and to try and expand their territories at the expense of neighboring groups.

Archaic humans (early Homo) and carnivores inhabited the Early and Middle Pleistocene landscapes of Europe, and shared ecosystems for more than 1 million years. Indeed, many archaeo-palaeontological sites evidence the co-existence of humans and carnivores, and demonstrate a certain degree of human-carnivore competition for acquisition and exploitation of animal (meat/bone) resources. We investigate here the role of large carnivores in the evolution of hominin subsistence strategies during the Early and Middle Pleistocene of Europe, focusing on important renewals in the carnivore guilds, and their significance in terms of carrion availability for scavenging and human-carnivore competition for access to food resources. Based on a previous ecomorphological approach of carnivore guild analysis [1], a modified version was recently employed [2] and is presented herein, combining four ecomorphological/behavioral parameters of large carnivores (body mass-BM, diet, hunting strategy, sociality) that practice hunting and/or scavenging on large prey. 3D guild structure diagrams were constructed and analyzed aiming to: 1) examine the community structure and dynamics of the predatory guilds, 2) infer the possible role of carnivores in the changes of early Homo subsistence strategies (passive/active scavenging and hunting), and 3) assess the role of hominins within the guilds. The late Villafranchian–Epivillafranchian (Early Pleistocene) carnivore guild was dominated by large-sized, hypercarnivorous and ambush-hunting felids (e.g., the saber-toothed cats Megantereon and Homotherium), and by the large-sized, bone-cracking and scavenging hyaenid Pachycrocuta. Τhe latter in particular was the most direct competitor of Homo for scavenging food resources (leftovers) left behind mainly by the saber-toothed cats [3]. As a member of the predatory guild (evident from the presence of cut and percussion marks on mammal bones), Homo would occupy the ecological space that was “available” for a predator with a 30–100 kg BM and a (mostly?) scavenging behavior, perhaps with a hypocarnivorous/carnivorous diet according to ecological circumstances and geographic setting. Τhe disappearance of most of the Early Pleistocene carnivore components (including Pachycrocuta and Megantereon) towards the end of this period, and their replacement by the Galerian (Middle Pleistocene) to modern hyenas and felids, resulted in the change of the structure and dynamics of the guild. Most notably, this reorganization included the decrease of carrion providers (hunters), and the higher representation of species with scavenging, bone-cracking and pack-hunting behavior. In this Middle Pleistocene guild, Homo would occupy the niche that was previously held by Megantereon, in the group of predators with 30–100 kg BM. Similar to Megantereon, humans could have a carnivorous to hypercarnivorous diet, but unlike the solitary and “ambush-and-slash” felid, the biological, technological, cultural and social developments would have allowed humans to employ a modified hunting strategy: the cooperative “ambush-and-spear” strategy (in accordance with the use of hunting spears during this period). The incorporation of such hunting behavior made humans fairly independent of erratic food sources from scavenging carnivore kills and allowed the provisioning of animal resources on a more regular basis. Moreover, even though the carnivore diversity slightly increased during this period, carnivore representation in the archaeo-palaeontological localities is rather low in both species and specimens number. This is possibly an anthropogenic effect on the ecosystem due to: 1) the firmer establishment of the hominin niche, including anti-predator strategies and expulsion of large carnivores from the region of human influence; and 2) the reduction of food quantity through human confrontational scavenging or decrease in prey availability through human hunting (see also [4] and [5]).

With an age of ~1.4 Ma, the Early Pleistocene archaeopaleontological sites of Barranco Le on and Fuente Nueva-3 (Orce, Baza Basin, SE Spain) provide the oldest evidence on human presence in Western Europe, including the finding of a deciduous tooth of Homo sp., huge lithic assemblages of Oldowan tradition and abundant cut-marks on large mammal bones. Here we use a mathematical approach based on Leslie matrices to quantify for the large mammal species preserved at the sites the biomass of primary consumers available, the distribution of meat resources among the secondary consumers and the competition intensity within the carnivore guild. The results obtained show a community of large mammals with a high diversity of secondary consumers that would satisfy slightly less than half of their dietary requirements under optimal ecological conditions. In the case of Homo sp., and considering that flesh resources were obtained through the scavenging of ungulate carcasses, the model indicates that the ecosystems of the basin could hold 10e14 individuals per 100 km 2 during a year, a value that is close to the mean population density of recent hunter-gatherers. These density estimates decrease slightly when a mixed hunting-scavenging strategy is considered and even more in the case of a strict hunting behavior. In addition, the value of the species competition index obtained for Homo sp. is among the lowest of the carnivore guild. These results suggest that the hominin populations that inhabited Southeast Spain during the Early Pleistocene behaved more as opportunistic scavengers than as active predators.