The common marmoset and the black-tufted marmoset are adorable little monkeys. But their presence in so many states has taken away space from native and endangered species.

Besides the giant anteater, there are two other very different anteaters that few people know about - the southern tamandua and the silky anteater.

Otters, weasels, ferrets and tayaras. Learn which species can be found throughout the country, how to identify them, and what their habits are.

Learn the differences, similarities, and some curious facts about pacas, pacaranas and, agoutis

Guinea pigs, rock cavies, and capybaras all belong to the same family. This means that the world's largest rodent is in the same family as the little guinea pigs we raise at home.

Although Brazil has the greatest deer diversity in the world, most species are practically unknown.

The river dolphins are part of one of the most popular legends in Brazil. But what do we know about them?

Procionids are members of the raccoon family. Although raccoons are very popular, their cousins are unknown to most people.

Although they are the largest and one of the oldest mammals in South America, they are still very little known.