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Behaviour could be less routine and automatic. There is even a discernible possibility of leisure.
    Big-game hunting was the other great achievement of Homo erectus . Its origins must lie far back in the scavenging which turned vegetarian hominids into omnivores. Meat-eating provided concentrated protein. It released meat-eaters from the incessant nibbling of so many vegetarian creatures, and so permitted economies of effort. It is one of the first signs that the capacity for conscious restraint is at work when food is being carried home to be shared tomorrow rather than consumed on the spot today. At the beginning of the archaeological record, an elephant and perhaps a few giraffes and buffaloes were among the beasts whose scavenged meat was consumed at Olduvai, but for a long time the bones of smaller animals vastly preponderate in the rubbish. By about three hundred thousand years ago the picture is wholly altered.
    This may be where we can find a clue to the way by which Australopithecus and his relatives were replaced by the bigger, more efficient Homo erectus . A new food supply permits larger consumption but also imposes new environments: game has to be followed if meat-eating becomes general. As the hominids become more or less parasitic upon other species there follows further exploration of territory and new settlements, too, as sites particularly favoured by the mammoth or woolly rhinoceros are identified. Knowledge of such facts has to be learnt and passed on; technique has to be transmitted and guarded, for the skills required to trap, kill and dismember the huge beasts of antiquity were enormous in relation to anything which preceded them. What is more, they were cooperative skills: only large numbers could carry out so complex an operation as the driving – perhaps by fire – of game to a killing-ground favourable because of bogs in which a weighty creature would flounder, or because of a precipice, well-placed vantage points, or secure platforms for the hunters. Few weapons were available to supplement natural traps and, once dead, thevictims presented further problems. With only wood, stone and flint, they had to be cut up and removed to the home base. Once carried home, the new supplies of meat mark another step towards the provision of leisure as the consumer is released for a time from the drudgery of ceaselessly rummaging in his environment for small, but continuously available, quantities of nourishment.
    It is very difficult not to feel that this is an epoch of crucial significance. Considered against a background of millions of years of evolution, the pace of change, though still unbelievably slow in terms of later societies, is quickening. These are not men as we know them, but they are beginning to be manlike creatures: the greatest of predators is beginning to stir in his cradle. Something like a true society, too, is dimly discernible, not merely in the complicated cooperative hunting enterprises, but in what this implies in passing on knowledge from generation to generation. Culture and tradition are slowly taking over from genetic mutation and natural selection as the primary sources of change among the hominids. It is the groups with the best ‘memories’ of effective techniques which will carry forward evolution. The importance of experience was very great, for knowledge of methods which were likely to succeed rested upon it, not (as increasingly in modern society) on experiment and analysis. This fact alone would have given new importance to the older and more experienced. They knew how things were done and what methods worked and they did so at a time when the home base and big-game hunting made their maintenance by the group easier. They would not have been very old, of course. Very few can have lived more than forty years.
    Selection also favoured those groups whose members not only had good memories but the increasing power to reflect upon it given by speech. We know very little about