Wolverines consist of two extant species, by the improbable name of Gulo gulo gulo or Gulo gulo luscus. Although few fossil remains of this type have been found, this is not unusual, since fossilization of forest-dwelling animals is rare. Wolverine’s closest ancestor, Plesiogulo, originated around 24 million years ago and migrated to North America 6.5 to 7 million years ago. The exact time of evolution from Plesiogulo to Gulo gulo gulo is unknown. Scientists have found evidence of species evolution within wolverine fossils over the past 1.8 million years.
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