This is what happens in my head when I see a photograph of a "giant, fossilized, prehistoric, dragonfly" and the photographer doesn't bother to include in the photograph something to give you an idea of the actual size.

BTW, "The Prairie Martian" is 99 cents (for the kindle) on Amazon between now and when the aliens come to harvest all of Earth's eReader devices (so you better hurry):
https://www.amazon.com/dp/B01LBXL4L8