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The capybara[note 1] or greater capybara (Hydrochoerus hydrochaeris) is a giant cavy rodent native to South America. It is the largest living rodent[2] and a member of the genus Hydrochoerus. The only other extant member is the lesser capybara (Hydrochoerus isthmius). Its close relatives include guinea pigs and rock cavies, and it is more distantly related to the agouti, the chinchilla, and the nutria. The capybara inhabits savannas and dense forests and lives near bodies of water. It is a highly social species and can be found in groups as large as 100 individuals, but usually lives in groups of 10–20 individuals. The capybara is hunted for its meat and hide and also for grease from its thick fatty skin.[3] It is not considered a threatened species.

The capybara[note 1] or greater capybara (Hydrochoerus hydrochaeris) is a giant cavy rodent native to South America. It is the largest living rodent[2] and a member of the genus Hydrochoerus. The only other extant member is the lesser capybara (Hydrochoerus isthmius). Its close relatives include guinea pigs and rock cavies, and it is more distantly related to the agouti, the chinchilla, and the nutria. The capybara inhabits savannas and dense forests and lives near bodies of water. It is a highly social species and can be found in groups as large as 100 individuals, but usually lives in groups of 10–20 individuals. The capybara is hunted for its meat and hide and also for grease from its thick fatty skin.[3] It is not considered a threatened species.

When in estrus, the female's scent changes subtly and nearby males begin pursuit.[37] In addition, a female alerts males she is in estrus by whistling through her nose.[29] During mating, the female has the advantage and mating choice. Capybaras mate only in water, and if a female does not want to mate with a certain male, she either submerges or leaves the water.[29][34] Dominant males are highly protective of the females, but they usually cannot prevent some of the subordinates from copulating.[37] The larger the group, the harder it is for the male to watch all the females. Dominant males secure significantly more matings than each subordinate, but subordinate males, as a class, are responsible for more matings than each dominant male.[37] The lifespan of the capybara's sperm is longer than that of other rodents.[38]

Capybara gestation is 130–150 days, and produces a litter of four young on average, but may produce between one and eight in a single litter.[7] Birth is on land and the female rejoins the group within a few hours of delivering the newborn capybaras, which join the group as soon as they are mobile. Within a week, the young can eat grass, but continue to suckle—from any female in the group—until weaned around 16 weeks. The young form a group within the main group.[19] Alloparenting has been observed in this species.[34] Breeding peaks between April and May in Venezuela and between October and November in Mato Grosso, Brazil.[7]