Focuses on current research in the field of evolutionary endocrinology. Hormones circulate systemically to signal diverse cells and tissues, influencing and coordinating nearly all aspects of the phenotype, including behavior, morphology, physiology, and life history. The field of evolutionary endocrinology emphasizes ultimate explanations, such as how hormones act as mediators of a variety of fundamental evolutionary phenomena from circadian rhythms to sexuality. Explores how and why natural selection shaped the "inputs" and "outputs" of the endocrine system. Effective Fall 2021, this course fulfills a single unit in each of the following BU Hub areas: Oral and/or Signed Communication, Scientific Inquiry II, Teamwork/Collaboration.