The mongoose family, Herpestidae, includes several species that comprise the most social small Carnivora. The small Indian mongoose Herpestes javanicus (E. Geoffroy Saint-Hilaire, 1818), a South Asian species that has been introduced to numerous Caribbean and Pacific islands, has not been reported to show complex sociality. A radio-tracking study conducted on Oahu, Hawaii, revealed that a group of at least 5, and perhaps more than 10, large males in the study area shared a single, large home range during the breeding season. Members of this group spent far more time than expected within 20 m of fellow members. Group members frequently shared dens, sleeping within 50 cm of each other. Females maintained very small, overlapping home ranges inside the male group's range. Male breeding coalitions have previously been reported in a congeneric species, the slender mongoose Herpestes sanguineus.
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