Genus Hydrochoerus is the scientific name for the capybara, which is the largest rodent in the world. The word 'Hydrochoerus' is derived from the Greek words 'hydro' meaning water and 'choeros' meaning hog. Some common synonyms for the genus Hydrochoerus are Cavy, Carpincho, and Chigüire. The name Cavy is a general term used for any type of rodent belonging to the family Cavidae. The name Carpincho is used in South America, especially in Argentina, to refer to the capybara. The name Chigüire is commonly used in Venezuela and Colombia to refer to the animal. Regardless of what it is called, the capybara is a fascinating animal that can be found in many parts of South America.