One of the large herbivores that inhabited this region was the Macraucheniacorresponding to an extinct group of mammals (Litopterna).It reached a weight of 900 kg, approximately the weight of a camel.

One of its most striking features is that it presents a retraction of the nostrils, which could be related to the presence of a short trunk. It also had a relatively long neck.

There is very little evidence of this animal, having recovered only a phalanx in the Mylodon Cave.