What are Invasive Exotic Species? The Naturalist Claudio Bertonatti travels throughout Argentina to find the answer. Beavers in Tierra del Fuego, Red-bellied Squirrels in Lujan, Wild boars in Entre Ríos. Invasive Exotic Species are the second leading cause of biodiversity loss globally. These are animals, plants, fungi, algae or microorganisms that humans carry outside the limits of their distribution. The invasions are silent, they are invisible and in many cases their effects are manifested when it is too late to stop them. Invasive Exotic Species profoundly alter ecosystems and their biodiversity, endanger native species, produce significant economic losses and in some cases threaten Public Health.