Might the environmental conditions have been just right for giant Permian insects? "If we look at that wiggly graph of oxygen levels going up and down over time, corresponding almost exactly is the size of the largest insects around that time as well," says Cockerill. But atmospheric oxygen levels alone might not be the only reason for the difference in insect sizes. The abundance of small prey and absence of birds (who were yet to feature in the tree of life), might also have allowed invertebrates to flourish.
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