Why do such differences exist in reproductive strategies?

Diversity in hormone-behavior relations--cues that activate/coordinate behavior

Social stimuli:

• basic relationships--focusing on the male:

  • polygamous species--high degree of male-male interactions--low degree of parental care--high levels of testosterone that are prolonged
  • monogamous species--low degree of male-male interactions--high degree of parental care--low levels of testosterone that are transient

• key point: different social systems are associated with different degrees of behavior (male-male interactions and male-young interactions) and with different patterns of testosterone secretion

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