Mongooses exhibit a variety of mating systems depending on the species. The most common mating system among mongooses is polygynous, where a dominant male mates with multiple females within a group. This is seen in species like the banded mongoose and meerkat. However, some species, such as the dwarf mongoose, practice monogamy, where a single male pairs with a single female. Other species may exhibit promiscuous mating, where both males and females mate with multiple partners. The specific mating system can vary based on factors like social structure, resource availability, and competition for mates.