Polygyny in animals

Polygyny in animals is a mating system in which one male lives and mates with more than one female. Each female only mates with a single male. If several females mate with several males it is either as promiscuity or polygynandry.
Typical polygyny is one-male, multi-female groups. The system is widespread. Examples are elephant seal, spotted hyena, gorilla, house wren, hamadryas baboon, common pheasant, red deer, Bengal tiger.