Females of most species generally invest more in producing and nurturing young and tend to have more steady reproductive success. [Yet these scientists speculate that] [w]ith only a limited number of breeding pairs, many of the females don't get to nest each year. On the other hand, unpaired males still have chances to father young through infidelity with one of the breeding females. Competition to be chosen as a mate is somewhat relaxed for males but intensified for females.
And that is how the story goes in contrast between species who raise their young familial or communal.
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