Wait, so a fair number of the Fox-poisoned believe major American cities are smoldering ruins? Good gravy, some people need to turn off their televisions and get some air.
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This work by Matthew Wills is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 United States License.
Backyard and Beyond 
I was told epiaeschna heros (swamp darner) is the largest. I have found it most often foraging bugs from automobile radiators at stop lights, but did see a few on bushes in the park.
Swamp Darners are a bit larger.