Chapter 5: Reproduction. Wide range of reproduction/fertility rates Book lists 1.2 for Russia to 8.0 for Niger. In Conambo it is 9! Species-Specific patterns Loss of Estrus In estrus all of the time The sex contract (Helen Fisher). Bipedalism and Big-Head Babies
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When a mother calculates the costs and benefits of how much to invest, or whether or not to invest, in a particular offspring she is weighing the reproductive value of this offspring against the reproduction value of existing offspring or future offspring.