Reuters has run an article about capybaras and squirrel monkeys that live together in an enclosure at the Tobu Zoo outside Tokyo:

The monkeys ride on the capybara’s backs and kiss the world’s largest rodents, who tolerate their tricks. But in the wild, their paths do not cross — capybara’s live on river banks while the monkeys live in forests.

Keepers at the Tobu zoo said it took the capybaras years to tolerate the monkeys.

Both species hail from South America and are not carnivores but at another Japanese zoo, a capybara mauled a monkey to death in their shared enclosure, proof that the cohabitation of the species is not always peaceful….

..”I don’t think this necessarily means that capybaras and squirrel monkeys are compatible in general.”

The full article can be found here.