Likely to be Mahale customs 77 Likely to be M group customs 92 Likely to be habits of a few M group chimpanzees 54 Likely to be idiosyncracies of M group chimpanzees 891 Discussion 211 results. Thus, we have obtained 2 3 behavior patterns likely shared by the common ancestors of Homo and Pan, 157 patterns likely to be shared by commons ancestors of chimpanzees and bonobos, 12 patterns likely to be chimpanzee universals, 79 patterns likely shared by eastern subspecies, 43 patterns likely to be Mahale cultures, 77 patterns likely to be M group cultures, 93 patterns likely to be habitual among a few M group chimpanzees, and 54 patterns likely to be idiosyncracies of M group chimpanzees. We are sure that the last common ancestors of