"Dusky-footed Woodrats, which are really very small rodents, build huge, elaborate houses of sticks. A house can measure more than a meter in diameter and be a meter high—and one Woodrat may have as many as three houses. Houses usually include several nesting and resting chambers and several for storing food and other treasures: Woodrats bring home a great many tidbits lost by or stolen from humans, often shiny objects like pens or keys. Why Woodrats do this is a mystery. Sometimes a latrine is included within the house, and sometimes it is located outside. Woodrats tend to be solitary, but the houses, which can be built on the ground, in the tree canopy, on rocky slopes, or even in abandoned buildings, are used by one Woodrat after another. Dusky-footed Woodrats tend to live in woods where there is a dense understory. Mice in the genus Peromyscus
are often found in the same places, sometimes even living in Woodrats' houses."
Links:Mammal Species of the WorldClick here for The American Society of Mammalogists species account
Original description: Baird, S.F., 1857 . Mammals. In Reports of explorations and surveys, to ascertain the most practicable and economical route for a railroad from the Mississippi River to the Pacific Ocean. Vol. 8, Pt. 1, p. 495. Beverly Tucker Printer, Washington, D.C., 8(1):1-757.