Nasua nasua, the ring-tailed coati, is a medium-sized, omnivorous, social, diurnal, forest-living carnivore distributed throughout much of South America. Few documented cases of invasive coatis exist. However, given their ability to feed from anthropogenic food resources, high densities in some Brazilian urban parks, and their omnivorous diets which may lead to adverse environmental effects on prey items, they should be considered to have the potential to be invasive. Reported introductions of N. nasua are limited to the Juan Fernández Islands in Chile, where the species was introduced in the early 20th century and may have negative impacts on native birds.