The largest cave in the monument is the long Milodón Cave. It was discovered in 1895 by
Hermann Eberhard, German explorer of Patagonia. He found a large, seemingly fresh piece of skin of an unidentified animal. In 1896 the cave was explored by
Otto Nordenskjöld and later it was recognized that the skin belonged to
Mylodon – an extinct animal which died 10,200–13,560 years ago. In the cave and other caves of the monument have been found remnants of other extinct animals and human remnants. At the entrance of the monument is a life size replica of the prehistoric
Mylodon, which was a very large herbivore, somewhat resembling a large bear. It became extinct at the end of the
Pleistocene Epoch. == Animal remains ==