A little armadillo, the mulita, is the living representative of the antediluvian giants Mylodon, Megatherium, &c. The ostrich-Rhea americana-roams everywhere in the plains; and there are a few specimens of the vulture tribe, a native crow (lean, tall and ruffed), partridges and quails.
Of the Pleistocene and recent deposits the most interesting are the remains of extinct animals (Glyptodon, Mylodon, Megatherium, &c.) in the caves of the Sao Francisco.
For certain small ground-sloths from Patagonia with Megatherium- like teeth, see MYLODON.
In certain species of mylodon the front pair of teeth in each jaw is placed some distance in front of the rest and has the crown surface obliquely bevelled by From Owen.
Special interest attaches to the recent discovery in the cavern of Ultima Esperanza, South Patagonia, of remains of the genus Glossotherium, or Grypotherium, a near relative of Mylodon, but differing from it in having a bony arch connecting the nasal bones of the skull with the premaxillae; these include a considerable portion of the skin with the hair attached.