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The Intelligent Animal
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able to learn accepted actually animals are able anthropologists attempt auxiliary consequences believed birds birth control cause Chapter child childbed fever chimpanzee chimps clinic communication connection cultural lag early humans environment example experimental experiments falsifiable fomites gesture girls human learning hypoth hypotheses ideas Ignaz Semmelweis ignorant imitative important knowledge least long-term magic and religion magical or religious marriage methods of birth modern societies never non-contiguous objectively functional occur permissive societies possible pregnancy premarital sex prevent primitive societies primitive tribes probably problem prohibit proposed entities psychologists punishment rats reason religious explanations representational art restrictive result scientific discoveries scientists secondary learning Semmelweis separated foresight separated learning separated relationships sex-pregnancy relationship sexual activities sexual intercourse sexual norms Skinner box species survival symbolic language taboos testable tion trial and error Trobrianders type of learning unique ability usually valid women word yellow fever young