Beetles in this order are distinguished by having up to 100 separate silk glands. Each one of them opens to the outside through a hollow hair. In this way, the spiders weave shelters in which they live. In temperate climates, they build their nests with denser silk tissues and retreat inside them during those times of the year when the weather is unsuitable. These beetles, having remained the same for tens of millions of years, challenge the theory of evolution.