Polyandry

In social anthropology and sociobiology, polyandry (Greek: poly many, andros man) means a female forming a stable sexual union with more than one male.

Sociobiology

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 Galapagos Hawk, a group of two or more males (which may or may not be related) and one female collectively care for a single nest. The latter situation more closely resembles typical human fraternal polyandry.

Related Topics:
Mating system - Jacana - Polygynous - Parental care - Galapagos Hawk

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These two forms reflect different resource situations: polyandry with shared parental care is more likely in very difficult environments, where the efforts of more than two parents are needed to give a reasonable chance of rearing young successfully.

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