Why do such differences exist in reproductive strategies?
Diversity in hormone-behavior relations--cues that activate/coordinate behavior
the social system of a number of species of birds are associated with different endocrine profiles and different male-female and male-young interactions
- monogamous species: one male bird pairs with one female
- polygamous species: one male pairs with two or more females
- levels of parental care: to what extent does the male help in raising the young?
- levels of aggression: degree of male-male interaction (low--moderate--high)
- levels of testosterone: low--high, transient--prolonged
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