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Capybara (Hydrochoerus hydrochaeris) is the largest species of rodent in the world, followed by the beaver, porcupine, and mara. Its closest relatives are agouti, chinchillas, coypu, and guinea pigs. Native to South America, 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 not a threatened species, though it is hunted for its meat and hide and also for the grease from its thick, fatty skin, which is used in the pharmaceutical trade.
In the Yahoo teaser trailer for Rio 2, a Capybara named Claira sings a song before being eaten by a black jaguar. The same scene is shown in the teatrical trailer. A number of unnamed Capybaras are also seen throughout the film, most notably a group of acrobatic performers who audition for the "Amazon Untamed" show (most of whom end up getting eaten by piranha).