From the outset, again, our ancestor may have attacked big game, probably Ungulates—to whom he owed much; for not only did they provide prey, but by clearing the forest over wide areas compelled him to run in pursuit remote from his native trees, thus giving great selective advantage to every variation of legs and feet adapted to running: though at the very first there may have been little need to run, as he was not yet an object of terror; “we must remember that if man was unskilful, animals were unsuspicious.”[36] I suppose him, at first, to have fallen to with hands and teeth: combining with others in a hungry, savage onslaught. By attacking big game advantage was given to those individuals and families who co-operated in hunting: thus forming the primal society of the human stock; a society entirely different from that of any of the Primates, or of cattle, and most like that of the dogs and wolves—a hunting-pack. As in the course of generations the hunting-pack developed, no doubt, it had recognised leaders, the most powerful males, one perhaps pre-eminent. But it was not subject to one old male who claimed all the females; for the more adult males it comprised, the stronger it was; and, for the same reason, pairing, as among wolves, was the most efficient form of sexual relationship. But, in my judgment, it is altogether vain to try to deduce from this form of society, which may have existed three or four million years ago, any of the known customs of savages concerning marriage, such as avoidance, totemism, exogamy; which would be of comparatively recent date if we put back their origin 500,000 years. Many such rules can only have arisen when there was already a tradition and a language capable of expressing relationships. § 4. PSYCHOLOGY OF THE HUNTING-PACK Possibly our ape-like ancestor was more sociable than any of the anthropoids; but sociability in ape-life would in no way account for our present character as men: nothing accounts for it, except the early formation of the hunting-pack. Since, however, we can know nothing of that institution directly, we must try to learn something about it from the parallel case of dogs and wolves. Galton remarks how readily the proceedings of man and dog “are intelligible to one another. Every whine or bark of the dog, each of his fawning, savage, or timorous movements is the exact counterpart of what would have been the man’s behaviour, had he felt similar emotions. As the man understands the thoughts of the dog, so the dog understands the thoughts of the man, by attending to his natural voice, his countenance, and his actions.”[37] No more, if as much, could be said of the terms upon which we stand with a tame chimpanzee, in spite of greater physical and facial resemblance and nearer kinship. What can connect us so closely in mind with an animal so remote from us in lineage and anatomy as the dog is? Adaptation to the same social conditions, the life of the hunting-pack.