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The capybara[a] or greater capybara (Hydrochoerus hydrochaeris) is the largest living rodent, native to South America. It is a member of the genus Hydrochoerus. 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 one hundred individuals, but usually live in groups of 10–20 individuals. The capybara is hunted for its meat and hide and also for grease from its thick fatty skin.
Its common name is derived from Tupi ka'apiûara, a complex agglutination of kaá (leaf) + píi (slender) + ú (eat) + ara (a suffix for agent nouns), meaning "one who eats slender leaves", or "grass-eater". The genus name, hydrochoerus, comes from Greek ὕδωρ (hýdor "water") and χοῖρος (choíros "pig, hog") and the species name, hydrochaeris, comes from Greek ὕδωρ (hýdor "water") and χαίρω (chairo "feel happy, enjoy").
