thumb|The pygmy three-toed sloth was first described in 2001. Several anthropological and archaeological developments were made in 2001, including the extraction of mtDNA from prehistoric skeletons and the discovery of an arrowhead lodged in the shoulder of Ötzi, a 5,300-year-old mummy, after a CT scan was performed on him. Newly described hominids included Sahelanthropus and Ardipithecus, while two additional hominids, Kenyanthropus and Orrorin, were proposed. January saw the extraction of DNA from a 60,000-year-old skeleton, the oldest human DNA to be studied to that point. In October, the discovery of a prehistoric Sarcosuchus skeleton was announced after digging began the previous year. Archaeological discoveries include rock art in Andros, 40,000-year-old tools in Mamontovaya Kurya, terracotta citizens in a pit adjacent to the Terracotta Army, a walled city at Dholavira, and a 2,900-year-old sweat lodge in Cuello.
thumb|the pygmy three-toed sloth was first described in 2001 several anthropological and archaeological developments were made in 2001 including the extraction of mtdna from prehistoric skeletons and the discovery of an arrowhead lodged in the shoulder of ötzi a 5300-year-old mummy after a ct scan was performed on him newly described hominids included sahelanthropus and ardipithecus while two additional hominids kenyanthropus and orrorin were proposed january saw the extraction of dna from a 60000-year-old skeleton the oldest human dna to be studied to that point in october the discovery of a prehistoric sarcosuchus skeleton was announced after digging began the previous year archaeological discoveries include rock art in andros 40000-year-old tools in mamontovaya kurya terracotta citizens in a pit adjacent to the terracotta army a walled city at dholavira and a 2900-year-old sweat lodge in cuello