An entomological rule of thumb is that insects are active in the spring, summer, and fall, but not the winter. It is what we always expect and even come to rely on. By the time winter hits, insects should either be smart enough to come in out of the cold, or they should have figured out a way to “sleep” through the winter. This rule is followed by 99.9% of all insects. One stark exception is sometimes noticed on the surface of the snow on sunny days, right smack in the dead of winter.