What is the general approach weasels take regarding shelter construction instead of digging elaborate homes?

Utilizing existing structures opportunistically

Weasels exhibit a highly pragmatic and opportunistic approach to shelter, lacking the instinct or physical capability to excavate large, permanent underground residences. Instead of building from scratch, they rely heavily on pre-existing architecture found within their environment. Prime examples of these readily available shelters include the abandoned burrows created by other small mammals such as voles or ground squirrels, the natural hollow spaces found beneath large boulders or rock outcrops, and the interior spaces within decaying logs or existing woodpiles. An ideal location is therefore often judged by the abundance of these ready-made hideouts rather than newly dug ones.