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Hospital staff move a bomb victim to an emergency ward in Kabul, Afghanistan, Thursday, March 21, 2019. Mourners lay flowers near the Al Noor mosque in Christchurch, New Zealand, Thursday, March 21, 2019. Firefighters stand by the gutted remains of a bus in San Donato Milanese, near Milan, Italy, March 21, 2019. This 1945 photo provided by the Utah National Guard shows Army Air Forces 2nd Lt. This article is missing information about polygamy in history.

Please expand the article to include this information. Further details may exist on the talk page. In contrast, monogamy is marriage consisting of only two parties. Like “monogamy”, the term “polygamy” is often used in a de facto sense, applied regardless of whether the state recognizes the relationship. Worldwide, different societies variously encourage, accept or outlaw polygamy.

Of societies which allow or tolerate polygamy, in the vast majority of cases the form accepted is polygyny. According to scientific studies, the human mating system is considered to be primarily monogamous, with cultural practice of polygamy to be in the minority, based on both surveys of world populations, and on characteristics of human reproductive physiology. Polygyny, the practice wherein a man has more than one wife at the same time, is by far the most common form of polygamy. East and West Africa, showing higher female agricultural contributions in East Africa and higher polygyny rates in West Africa, especially the West African savanna, where one finds especially high male agricultural contributions.

Polygynous marriages fall into two types: sororal polygyny, in which the co-wives are sisters, and non-sororal, where the co-wives are not related. Polygyny may also result from the practice of levirate marriage. Marriage is the moment at which a new household is formed, but different arrangements may occur depending upon the type of marriage and some polygamous marriages do not result in the formation of a single household. In many polygynous marriages the husband’s wives may live in separate households often at a great distance. They can thus be described as a “series of linked nuclear families with a ‘father’ in common”. Polyandry, the practice of a woman having more than one husband at the one time, is much less prevalent than polygyny and is now illegal in virtually every country in the world.