Moths under a porchlight ❄ The exposure time was 20 seconds.
The most widely accepted theory for this behavior is that they use the moon (and stars) as a means of navigation. Since the moon is incredibly far away, it doesn't appear to move with respect to the moth as it flies... the relative angle remains constant; they use it to fly in a straight line. When they confuse an artificial light for the moon, they become disoriented and spiral inward as they try to keep the relative position the same. Poor little guys.
I feel like humans do something like this... but I can't put my finger on it.
Photo by Canadian photographer and craftsman Steve Irvine www.steveirvine.com You can buy a print on the National Geographic webstore