Doedicurus clavicaudatus is the largest known species of glyptodont, an extinct subfamily of armadillos which lived in South America during the Pleistocene, until the end of the last glacial period, some 11,000 years ago. It had a height of 1.5 meters (4.9 ft) and an overall length of around 4 meters. Doedicurus could reach a mass of 1,910 to 2,370 kg. It had a huge domed carapace that was made of many tightly fitted scutes, somewhat similar to that of modern-day armadillos. Its tail was surrounded by a flexible sheath of bone and had long spikes or knobs on the end, at least in male individuals.
The animal inhabited woodlands and grasslands and was herbivorous. Its name means "pestle tail", referring to the shape of the tail with the spikes removed. Given the late date of its disappearance, it was encountered and probably also hunted by the first human settlers of South America.