Capyraba by Pierre Pouliquin Via Flickr: Rongeur: Capybara (the world's biggest rodent) pt.wikipedia.org/wiki/Capivara en.wikipedia.org/wiki/Capybara fr.wikipedia.org/wiki/Capybara es.wikipedia.org/wiki/Hydrochoerus_hydrochaeris The name originally derives from the Guarani word kapiÿva, meaning roughly "master of the grasses". In English, it is also sometimes called Water Hog.