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At a different time Goodall observed the following as several chimps approached a roaring waterfall.
"All at once Evered charged forward, leapt up to seize one of the hanging vines, and swung out over the stream in the spray-drenched wind. A moment later Freud joined him. The two leapt from one liana to the next, swinging into space, until it seemed the slender stems must snap or be torn from their lofty moorings. Frodo charged along the edge of the stream, hurling rock after rock now ahead, now to the side, his coat glistening with spray. For ten minutes the three performed their wild displays while Fifi and her younger offspring watched from one of the fall fig trees by the stream. (Goodall, Jane (1990) Through A Window. Houghton Mifflin: Boston p. 241) Geoffrey Miller, an evolutionary psychologist, has surmised that human beings evolved according to the dictates of sexual selection. In other words, certain behaviors were noted as highly valued, and members exhibiting those behaviors were chosen as procreation partners, with the skill and tendency to engage in the behavior being passed on genetically to their young. Miller and others suggest that if those behaviors were successful in enticing a mate, for example the chimpanzee displays noted above - evocative, creative, or unusual in some way - then that may have been the primary engine behind the exponential growth in human brain size and creativity. For example, males may have been selected by females for the novelty of their displays, novelty that may have evolved from a variety of throat noises and especially frisky body gyrations into proto-song and early dance. |
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