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Subjective well-being, happiness, and personality in animals.

Abstract
 In this chapter, the authors evaluates a subset of the evidence that our perceptions of animal happiness are accurate and that the 'happiness' that we see in other animals is much like the happiness that we see in other humans or experience ourselves. This evidence consists of work on the relationships between personality traits and subjective well-being, both of which are psychological constructs, a notion that will be define early on. Also in this chapter a brief discussion on the implications of these findings with regard to what they say about the evolution of happiness, the practical implications of these findings, and what they say about how one might be able to better understand the physiological bases of happiness were presented.