Even though there is only one visible entrance, woodrat nests have multiple escape routes. Each 'house' contains up to 2 nests, but usually only one woodrat will be found in each home. Houses can be up to 4 m in length, 2 m in width, and more than 1 m in height. The shape depends on the location and may be pyramidal, conical, or domed (if sufficient structural support is present). Nests may be found up to 8 m above ground in trees or vines, but normally are located at ground level. Houses are efficient shelters from temperature fluctuations and rain.