Arctotherium

Arctotherium is a genus of Central and South American short-faced bears within Ursidae of the Pleistocene.[1] Their ancestors migrated from North America to South America during the Great American Interchange, following the formation of the Isthmus of Panama during the late Pliocene. The oldest confirmed remains are those of A. angustidens from Buenos Aires, Argentina, dating to the Ensenadan epoch, 0.98 to 1.76 Ma old, within the Early to Middle Pleistocene,[1] with a tooth possibly belonging to Arctotherium dating about 2.588 Mya.[citation needed] Their closest known relative is the spectacled bear (Tremarctos ornatus).[2]