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  • Contents
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Evolutionary psychology is an important and rapidly expanding area in the life, social, and behavioral sciences, and this Handbook represents the most comprehensive and up-to-date reference text in the field today. Chapters in this Handbook address foundational theories and methodological approaches, providing a rich overview of the most important theoretical and empirical work in the field. The SAGE Handbook of Evolutionary Psychology is an essential resource for researchers, graduate students, and advanced undergraduate students in all areas of psychology, and in related disciplines across the life, social, and behavioral sciences. Part 1: Foundations of Evolution; Part 2: Middle-Level Evolutionary Theories; and Part 3: Research Methods and Strategies.

The Trivers–Willard Hypothesis
The trivers–willard hypothesis
Catherine Salmon Jessica Hehman

While many species do not engage in extensive parental care (Alcock, 2001), for others, including humans, parents contribute substantially to the survival and success of their offspring. Trivers (1972) defined parental investment as any investment by the parent in an individual offspring that increases the offspring's chance of surviving (and reproductive potential) at the expense of the parent's ability to invest in other offspring, current or future. For some species this investment consists mainly of providing food, shelter, and protection from predators. For humans, it involves not only these elements but also the tools for social success including the development of a variety of skills (everything from ...

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