When I arrived In the area where I was photographing the ground looked cold and I could not see any movement. After at least 20 minutes, when I was finishing up, I noticed one then another, then about six Concealer Moths in my immediate area flapping their wings as they appeared to bump along the ground. They were flying very short distances, often just above the ground, if not hitting the ground as they flew. Sometimes they would get to a stalk, which they would climb up rather than fly directly to the top. Later, looking at my photographs, I could see they were regularly cleaning their antennas. Their strange flying pattern intrigued me, as I was not sure if they were cold so were trying to warm up or if they were trying to search out liquid. I was also amazed how there appeared to be no insect life around that frosty patch then after, a little while, I was surrounded by these small moths.
This coouldbe the same speciesas 4208769, and might be the males of an unnamed species that has wingless females. If you come across this behaviour again, have a look for a female crawling around.