

Robust Ground Sloth
Glossotherium robustum
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Chordata
Mammalia
Pilosa
Mylodontoidea
Mylodontidae
Glossotherium robustum
The Southern Giant Ground Sloth, Glossotherium robustum, was a massive South American herbivore that roamed the open Pampas and wetlands of the Late Pleistocene, shaping the landscape as it foraged and dug for roots.
Description
Glossotherium robustum, commonly known as the Robust Tongue Beast, was a substantial ground sloth native to South America during the Pliocene and Pleistocene epochs. Measuring about 4 meters in length and standing 1.6 meters tall at the shoulders, it weighed between 1,000 and 1,500 kilograms. Its broad, muscular build and powerful limbs suggest it was well-adapted to its environment. Unlike modern tree-dwelling sloths, Glossotherium was terrestrial. Its broad snout and unique dentition indicate a diet primarily consisting of grasses and other low-lying vegetation, classifying it as a grazer. Notably, Glossotherium possessed a large nasal cavity, which may have been used to produce infrasound for communication or mating calls. Its robust forelimbs and claws suggest it could have been capable of digging, possibly creating burrows for shelter, making it one of the largest known burrowing mammals.
Quick Facts
Max Mass
Shoulder Height
Standing Height
Length
Diet
Trophic Level
1000
1.2
1.8
3.2
kg
m
m
m
Mixed Feeder
Herbivores – Browsers
Hunt History
Humans coexisted with Glossotherium robustum in South America, and there is archaeological evidence suggesting it was hunted and butchered by early Paleoindians. Its large size and slow movement would have made it a valuable but challenging prey animal.
Earliest Archaeological Evidence of Human Predation:
Arroyo Seco 2 (Buenos Aires Province, Argentina, ~12,000 BP) — Fossil bones of Glossotherium associated with Fishtail projectile points and cut marks consistent with butchery.
Campo Laborde (Pampas region, Argentina, ~12,600 BP) — Direct association of Glossotherium robustum remains with stone tools and evidence of human processing.
Paso Otero 5 (Buenos Aires Province, Argentina, ~12,500 BP) — Burned bone fragments and lithic tools linked to Glossotherium, suggesting carcass dismemberment and cooking.
Time & Range
Extinction Status
Globally Extinct
Extinction Date
Temporal Range
Region
10000
BP
Late Pleistocene
South America
Wiki Link
Fat Analysis
Fatness Profile:
Medium
Fat %
7
Est. Renderable Fat
70
kg
Targeted Organs
Subcutaneous pads, visceral fat
Adipose Depots
Subcutaneous pads (inguinal/abdominal), visceral; marrow
Preferred Cuts
Marrow & abdominal depots
Hunt Difficulty (x/5)
4





