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Ecological and physiological factors such as breeding density, breeding synchrony, and adult body condition can all affect extra‐pair mating behavior, but the relative importance of these factors may vary among species. White‐rumped Swallows (Tachycineta leucorrhoa) nesting in Buenos Aires Province, Argentina, exhibit high rates of extra‐pair paternity, with 77% of nests having extra‐pair young. Our...
Geographic patterns of variation in life‐history traits have puzzled researchers for decades. However, the widely accepted idea that mating systems exhibit a tropical–temperate latitudinal trend, with extra‐pair mating systems being the norm among temperate species and genetic monogamy the norm among tropical species, is supported by sparse data, particularly for birds breeding in the tropics and...
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