The most striking single fact about chimpanzees is flexibility of 【S1】______
their social life, the lack of any rigid form. of organization. It represents
about so far a departure from the baboon type of organization as one 【S2】______
can find among the higher primates (灵长目), and serves emphasizing 【S3】______
the great variety of primate adaptations. Chimpanzees are more huma
than baboons (狒狒), or rather they accord better by the way we like to 【S4】______
picture ourselves, as free—wheeling individuals who are tend to be 【S5】______
unpredictable, do not take readily to any form. of regimentation, and are
frequently charming. Two researches have described what they found
during more than eight months spending among chimpanzees in their 【S6】______
natural habitat, the forest: 'We were quite surprised to observe what 【S7】______
there is no single distinct social unit in chimpanzee society.
Not only is there no 'family' organization; so is there a 'troop' 【S8】______
Organization—that is to say, no particular chimpanzees keep
permanently together. On the contrary, individuals move about at will,
alone or in small groups best described as bands, that sometimes form 【S9】______
into large aggregations. They leave their associates if they want to, and
oin up with new ones with conflict. 【S10】______
【S1】

A.