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Polyandry in primates and other mammals is usually correlated with reduced or reverse sexual dimorphism — females larger than males.
When males of a species are much larger than females, polygyny is usually practiced.
As size difference decreases, or the females are larger than males, a species is more likely to practice monogamy or polyandry.
The great apes ( gorillas, orangutans, and chimpanzees ) are dimorphic and practice polygyny.
Male and female gibbons ( lesser apes ) are similar in size and form monogamous pairs.
Human males and females are less dimorphic in body size than other polygynous great apes.
Conversely, birds of prey-which show distinct reverse sexual dimorphism — tend to be monogamous for long periods or mate for life ; some species like the Snail kite will choose new mates every year, polygyny is noted in many Harriers and polyandry has been observed in the Harris ' Hawk ( notable for being the only bird of prey to regularly live and hunt in family and social groups ) and the aforementioned Galapagos hawk.

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