Arctotherium American short-faced bears within Ursidae. 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. Its large size has been attributed to increased competition from other, later-arriving or evolving carnivorans, such as jaguars, Protocyon or Smilodon, following the early dispersal of short-faced bears to South America.[4] The North American carnivorans that invaded South America, including short-faced bears and Smilodon, probably quickly dominated the predatory niches formerly occupied by the native typical South American groups such as metatherian
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Arctotherium American short-faced bears within Ursidae. 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. Its large size has been attributed to increased competition from other, later-arriving or evolving carnivorans, such as jaguars, Protocyon or Smilodon, following the early dispersal of short-faced bears to South America.[4] The North American carnivorans that invaded South America, including short-faced bears and Smilodon, probably quickly dominated the predatory niches formerly occupied by the native typical South American groups such as metatherian
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