Frederick Turner points out that the forty-seven cultural universals (to which he adds combat, gifts, mime, friendship, lying, love, storytelling, murder taboos, and poetic meter) make it "tempting to propose that a work of literary art can be fairly accurately gauged for greatness of quality by the number of these items it contains, embodies, and thematizes" (The Culture of Hope, 26), since "it is the function of [literature] to preserve, integrate and continually renew this deep syntax and lexicon [of cultural universals], while using it to construct coherent world-hypotheses" (26).
We have, according to Wilson (actually, George P. Murdock, who Wilson is quoting), sixty-seven cultural universals (On Human Nature, 160):
age-grading, athletic sports, bodily adornment, calendar, cleanliness training, community organization, cooking, cooperative labor, cosmology, courtship, dancing, decorative art, divination, division of labor, dream interpretation, education, eschatology, ethics, ethno-botany, etiquette, faith healing, family feasting, fire-making, folklore, food taboos, funeral rites, games, gestures, gift-giving, government, greetings, hair styles, hospitality, housing, hygiene, incest taboos, inheritance rules, joking, kin groups, kinship nomenclature, language, law, luck superstitions, magic, marriage, mealtimes, medicine, obstetrics, penal sanctions, personal names, population policy, postnatal care, pregnancy usages, property rights, propitiation of supernatural beings, puberty customs, religious ritual, residence rules, sexual restrictions, soul concepts, status differentiation, surgery, tool-making, trade, visiting, weather control, and weaving
Whereas I could identify in that list only twenty which chimpanzees share with humans: bodily adornment, cleanliness training (in some), community organization, cooperative labor (i.e., when they hunt), education (active teaching), family feasting (a true ritual in chimpanzees), games, gestures, gift-giving, greetings, hygiene (in cleaning each other of parasites), incest taboos (admittedly a questionable one, since it is clear the Westermarck effect is in effect, but not yet clear that it is also socially transmitted), kin groups, medicine (Frans de Waal, The Ape and the Sushi Master, 254-255), postnatal care, property rights (chimpanzees are very territorial), ritual (see family feasting, above), status differentiation, tool-making, and visiting. And this does not include the cultural differences found among chimpanzee troupes.
I say there are only twenty, but look at those twenty. Are we really so much better because we have developed calendars when chimpanzees have managed to develop medicine (albeit far more primitive than human medicine, to say the least, but quite impressive all the same). Many of those uniquely human cultural traits can be traced logically from this pool of twenty we share with our closest relatives. Religion rises from power (status differentiation), which would then naturally lead to things like divination and religious ritual (combining power with feeding rituals could do this). Government too would naturally arise in a species that has status differentiation and the need for rules. I could go on and on, but I think we can see how much of what we consider uniquely human is either shared by chimpanzees and bonobos or could arise quite naturally from a specialist species like chimpanzees to become a variety of things in a generalist species like humans.
This is highly suggestive of what ways we should investigate the similarities and differences between humans and chimpanzees. And as we can see, this also suggests how and why it's important to understand chimpanzees if you're going to understand the cultural role of literature.