Previously, primatologists believed that the differences in the societies of these two African ape species was due to their food. Gorillas prefer leaves, food which is super-abundantly available, and so they form cohesive groups with egalitarian relationships and do not exhibit territoriality. In contrast, chimpanzees eat mainly ripe fruit, which is patchily distributed throughout the forest, and so they form fission-fusion societies in which individuals frequently gather and separate, and they have clear dominant-subordinate relationships and territoriality.*
■References (Books, papers, Web articles, etc.)
『ゴリラ 第二版』 第6章 二つの類人猿——ゴリラとチンパンジー 山極寿一 （東京大学出版会、2005）
*Researchers believed that these ecological contrasts divided the ecological niches of the two species, enabling them to live sympatrically. This simple theory based on primate socio-ecology was long held to be accurate, until fieldworkers began to go into the lowland tropical forests in the 1980s and produce new findings.
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