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It evolved during the Pliocene Epoch and became extinct at the end of the Late Pleistocene, living from ~5 million to ~13,000 years ago. [3] The type species, M. jeffersonii (also called Jefferson's ground sloth), the youngest and largest known species, measured about 3 meters (9.8 ft) in length and weighed up to 1,000 kilograms (2,200 lb). [4]
A kill site dating to around 12,600 years Before Present (BP), is known from Campo Laborde in the Pampas in Argentina, where a single individual of M. americanum was slaughtered and butchered at the edge of a swamp, which is the only confirmed giant ground-sloth kill site in the Americas.
The earliest megatheriid in North America was Sibotherium which arrived 5.3 million years ago, after crossing the recently formed Panamanian land bridge. At more than five tons in weight, 6 metres (20 ft) in length, and able to reach as high as 5.2 metres (17 ft), Eremotherium when fully erect was taller than an African bush elephant bull.
Standing over 2 metres tall, with forelegs tipped with claws, giant sloths lived until around 11,000 years ago. Fossilised footprints in the salt flats of White Sands National Monument, in the ...
A morphological tree of Megalonychidae, based on the work of Stinnesbeck and colleagues (2021). [15] ( Note that this tree does not conform to genetic studies, as it includes the Caribbean sloths Neocnus, Parocnus Megalocnus and Arcatocnus which have been placed in the separate family Megalocnidae, well as the two toed sloths (Choloepus), which are placed in the clade Mylodontoidea).
At least some ground sloths engaged in long-term parental care, with one adult (presumably female) Megalonyx found with two juveniles of different ages, with the oldest juvenile suggested to be 3–4 years old. [31] Juvenile ground sloths may have clung to the body of their mother for some time following birth, as occurs in living tree sloths. [32]
An amateur archaeologist discovered a 1,000-year-old ring near the Scottish shore, providing valuable insights into the Pictish kingdom's history. An Amateur Archaeologist Found a 1,000-Year-Old ...
The oldest decorated wooden object ever found in ... 6,000-year-old wood carving could solve Stonehenge mystery ... carried out just 100 metres north of Stonehenge back in the 1960s suggest that a ...