The scientific name of which animal is translated from Greek as "water pig"?

The capybara or greater capybara (Hydrochoerus hydrochaeris) is a giant cavy rodent native to South America. It is the largest living rodent and 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 coypu. 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 scientific name, both "hydrochoerus" and "hydrochaeris", comes from Greek ὕδρω (hydro "water") and χοῖρος (choiros "pig, hog").

Capybaras are herbivores, grazing mainly on grasses and aquatic plants, as well as fruit and tree bark. They are very selective feeders and feed on the leaves of one species and disregard other species surrounding it.