More a theory of the biological basis of social behavior, ethology has offered certain views of intelligence:
a. As an evolved form of adaptive behavior, the capacity to learn, to store, to utilize information has evolved because adaption to varied environments has been required. The human species has been able to adapt to considerable variation in environmental demands and the intellectual qualities that have evolved have been passed onto future generations. One kind of evidence has been the increase in brain size and brain organization across evolution.
b. Although there are individual differences in intelligence, humans the world over do share certain commonalities in information processing. This is supported by cross-cultural research for Piaget's stages of cognitive development that appear to be universal in nature and thus evolved within the species.
c. Next, the ethological approach emphasizes the naturalistic study rather than psychometric study of intelligence.
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