This issue focuses on the neurobiology of social behavior. Animal species interact to reproduce, and sex requires at least some social communication. So the evolution of social behavior, including communication, evolved largely due to the selective pressures of reproduction. 'Social behavior' has many connotations so we define it operationally as 'interactive behavior among animals'. Feeding together in a group, for example, does not fit this definition per se, unless some form of communication also occurs. Social behaviors are widespread in the animal kingdom, reflecting their usefulness. Indeed, since interactions among animals ultimately affect fitness, social behavior evolved in response to natural and sexual selective pressures. For example, how did acoustic communication arise in different taxa? In their contribution,
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