What Happened to the Ancient Bug Giants of 300 Million Years Ago?
SMRTR summary
Ancient Earth hosted giant insects like 28-inch wingspan griffinflies during the Carboniferous period 300 million years ago when oxygen levels reached 30 percent. New research using electron microscopy revealed these mega-insects could have survived at today's lower oxygen levels, contradicting theories that oxygen availability limited insect size through their breathing tube capacity.
SMRTR provides this summary for quick context. The original article belongs to Nautilus.
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