Caplin Rous Capybara

A larger capybara called Neochoerus pinckneyi once existed in North America, having invaded that continent during the Great American Interchange that followed formation of the Isthmus of Panama. Other fossil caviomorphs that were eight times the size of modern capybaras have been called "capybaras" by the popular press, but were actually dinomyids related to the pacarana.
There is also an extant "lesser capybara", Hydrochoerus isthmius, with a disjoint range in Colombia, Venezuela and Panama.