Varied Carpet Beetle Anthrenus verbasci

Tiny at just 3 millimeters, this pest has made history: it was the first insect proven to have an annual behavioral cycle and remains the classic textbook example of circannual rhythms in animals. Museum curators know it well — its larvae are tiny destructors that munch through natural fibers, carpets, and priceless insect collections. This little beetle's ability to sense and prepare for seasonal changes months in advance makes it both a household nuisance and a biological marvel.