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Average ± standard error of the mean (SEM) reproductive output per age (a) for males (N = 86) and females (N = 132) that reached sexual maturity (≥4 years old) and (b) for males classified based on their reproductive success: top (N = 22 males), good (N = 22), poor (N = 22), and bottom (N = 20) breeders. Note that the x axis refers to the age at the time of birth of the offspring (rather than age at conception).
