Sexual dimorphism is a physical difference between males and females of a species. Reverse sexual dimorphism, when females are larger than males, has been observed across multiple owl species. The degree of size dimorphism varies across multiple populations and species, and is measured through various traits, such as wing span and body mass. Overall, female owls tend to be slightly larger than males.Owl the babe with the power shirt The exact explanation for this development in owls is unknown. However, several theories explain the development of sexual dimorphism in owls. Another popular theory suggests that females have not been selected to be smaller like male owls because of their sexual roles. In many species, female owls may not leave the nest.
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A different theory suggests that the size difference between male owls and females owls is due to sexual selection: since large females can choose their mate and may violently reject a male’s sexual advances, smaller male owls that have the ability to escape unreceptive females are more likely to have been selected.