Due to the advance of the cultivations, the autochthonous species diminished up to their extinction in some cases. Among the animals that were plentiful in the region until the arrival of the agricultural era, they were the deer, guanacos, mountain cats, matacos, gray foxes, zorrinos, mules, otters, tucu tucos, green lizards, vipers, turtles, pumas, minor ferrets, peludos, and so on.
The man introduced some exotic species, as the sparrow, the European hare, the rat, buck and others. These same animals displaced the indigenous birds and small rodents. The prevailing birds are the webfooted and wading, characteristic of aquatic environments. From some neighboring regions, species like the overa weasel, the hawk and the fishing eagle arrived to these territories.