Based on fossils discovered so far, it is believed that insects larger than today's pigeons roamed the Earth hundreds of millions of years ago. The prevailing theory is that these giant species could survive because the oxygen concentration in the atmosphere was higher than it is today, but new evidence has emerged that may overturn this theory.
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Based on fossils discovered so far, it is believed that insects larger than today's pigeons roamed the Earth hundreds of millions of years ago. The prevailing theory is that these giant species could survive because the oxygen concentration in the atmosphere was higher than it is today, but new evidence has emerged that may overturn this theory.