Polygynandrous
Polygynandrous describes a multi-male, multi-female polygamous mating system, such as that seen in lions and bonobos. Females are usually more numerous than the males and mating occurs only within the group. The advantage of this form of polygamy is greater genetic diversity, less need for males to compete with each other and greater protection for the young.
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Species with this adaptation
Mammals
Grey wolf 
Lion 
Polecat 
Raccoon 
Tasmanian devil 
Matschie's tree-kangaroo 
Chimpanzee 
Olive baboon About
Polygynandry occurs when two or more males have an exclusive relationship with two or more females. The numbers of males and females need not be equal, and in vertebrate species studied so far, the number of males is usually lower.
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- Polygynandry (wikipedia.org)
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