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Giant dragonflies once roamed Earth’s skies. New research upends the textbook theory of why they went extinct  The ConversationMassive insect body size 300 million years ago may not have been due to high atmospheric oxygen  Phys.orgOxygen supply through the tracheolar–muscle system does not constrain insect gigantism  Nature300 Million Years Ago, Insects Were Enormous. That Stopped – And We’re Probably Wrong About Why  IFLScienceGiant Dragonflies With 2-Foot Wingspans Ruled the Skies 300 Million Years Ago — But Oxygen May Not Explain Why  Discover Magazine