Polyandry
The term polyandry is used in related ways in social anthropology and sociobiology.
In social anthropology, polyandry is a marital practice in which a woman has more than one husband simultaneously. In rural regions of India, Nepal, China (in particular, Yunnan, Tibet and Zanskar), and surrounding nations, fraternal polyandry, in which two (or more) brothers marry the same woman, is culturally accepted. Polyandry is also the accepted norm in a few African societies. Note the limited geographical distribution of this marital practice.
Polyandry appears to be associated with some males being absent from the household for long periods. As some males return to the household, others leave for a long time. The wife almost always has a husband with her.
The term has been taken over into sociobiology, where it refers, analogously, to a mating system in which one female forms more or less permanent bonds to more than one male. It can take two different forms. In one, typified by the Northern Jacana and some other ground-living birds, the female takes on much the same role as the male in a polygynous species, holding a large territory within which several males build nests, laying eggs in all the nests, and playing little part in parental care. In the other form, typified by the Polygyny
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