Hydrochoerus


The genus Hydrochoerus contains two living and three extinct species of rodents from South America, the Caribbean island of Grenada, California and Panama. Capybaras are the largest living rodents in the world. The genus name is derived from Ancient Greek ὕδωρ, meaning "water", and χοῖρος, meaning "pig".

Characteristics

Capybaras are semiaquatic, found in and near lakes, rivers, swamps, and flooded savanna. Their diets are dominated by grasses. Adults weigh up to. The gestation period is 130–150 days, with two to eight young born to females.

Behavior

Capybaras are highly social, living in groups of up to 100 and communicating through a variety of vocalizations. Breeding is polygynous, with males forming harems.

Phylogeny and taxonomy

results have consistently suggested Hydrochoerus is most closely related to Kerodon, and the two evolved from within the Caviidae. This led Woods and Kilpatrick to unite the two into the subfamily Hydrochoerinae within the Caviidae. Based on use of a molecular clock approach, Hydrochoerus appears to have diverged from Kerodon in the late Middle Miocene.
The extinct North American species formerly recognized as Hydrochoerus holmesi is now assigned to Neochoerus.

Species

Extant Species

Fossils

Presently, capybaras live in northern South America and adjacent southern Central America and in the tropical to subtropical regions of South America. The fossil species inhabited Buenos Aires Province in Argentina and the Caribbean island of Grenada. One species, H. hesperotiganites even ranged as far north as California. Fossils of unspecified Hydrochoerus have been found in Late Pleistocene to Holocene sediments of Curití, Santander, at an altitude of in the Eastern Ranges of the Colombian Andes. Fauna found at the same site included the South American tapir, Cryptotis sp., collared peccary, white-lipped peccary, and Mazama sp.