This 4-hour time exposure is perhaps the best image of the elusive Blue Ghost Fireflies (BGFs) I've ever seen! It was taken by professional photographer Spencer Black on June 8, 2013 at Dupont Forest State Park near Hendersonville, NC. Black, from Asheville, NC is well known for his very-long-exposure night time photography, which is exactly the skill needed to photograph the rare BGFs.
Looking at the photo, imagine how dark the forest must have been as it took the camera lens 4 hours to capture even this much light! In addition, probably only a few BGFs were active during the 4 hr exposure; i.e., an observer may have seen only a small number of fireflies at any one time. Now imagine yourself alone and deep in the woods on a very dark night and seeing a few of these lights moving amid the trees and brush---if you didn't previously know what the BGFs were, you could easily be mystified by the lights. Given the behavior of the BGFs as highly sensitive to light (turning off when you turn on a flashlight & only coming back on when your turn your light off) and sensitive to air vibrations (turning off when you walk toward them & turning back on only when you stop moving)----one can easily understand how some uninformed observer can mistakenly think the lights are interacting with them (as in 'intelligent behavior'). We have some anecdotal stories of observers seeing lights that perfectly match those of the BGFs, including stories of some folks who were so terrified of the lights that they ran away or climbed trees to get away from them! And one observer on Brown Mountain in the early 1960's apparently intrepreted the lights as benovelent beings from Venus and allowed himself to be abducted!