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Insects outnumber humans by a lot and we only like to think we’re in charge because we’re bigger than they are. But insects and other arthropods weren’t always so small. About 315 million years ago during the Carboniferous Period, they were not only abundant: they were enormous.
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References:
http://news.nationalgeographic.com/news/2011/08/110808-ancient-insects-bugs-giants-oxygen-animals-science/
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0022610
https://www.wired.com/2010/11/huge-dragonflies-oxygen/
http://rspb.royalsocietypublishing.org/content/277/1690/1937.short
http://bionumbers.hms.harvard.edu/bionumber.aspx?id=113319
https://news.ucsc.edu/2012/06/giant-insects.html
https://www.si.edu/Encyclopedia_SI/nmnh/buginfo/bugnos.htm
http://www.pnas.org/content/96/20/10955.full
https://www.nap.edu/read/11630/chapter/8#117
