Answer:
The practice of having two or more wives or husbands.
Explanation:
Most such species exhibit polygyny, a marriage in which two or more women share a husband or a male have multiple partners. Some examples are red-winged blackbird( Agelaius pheoniceus ) and house social monogamy is common and polygamy is rare in birds but the reverse is true in mammals. A large fraction of mammals are polygamous. polygamy most common seen in animist and muslim communities of west africa.
Polyandryis related with polygyny in which involving one male and two or more females. If a marriage involves a plural number of husbands and wives of each gender, then it is called polygamy.
