The dusky-footed woodrat (Neotoma fuscipes) is a species of nocturnal rodent in the family Cricetidae.  They are commonly called "packrats" or "trade rats" and build large, domed dens that can reach several feet in height. Coyotes and other predators will attempt to prey on these rodents by laying waste to the dens, but the sheer volume of material is usually dissuasive. Occasionally, dusky-footed woodrats will build satellite dens in trees. Although these animals are solitary, except in the mating season (when they are most vulnerable to predation), dens are frequently found in clusters of up to several dozen, forming rough "communities". The mating system in this species appears to be variable, with promiscuity most generally at high population densities and monogamy at lower densities. 
They are similar in appearance to the common rat species Rattus rattus and Rattus norvegicus, but with larger ears and eyes, softer coats, and furred tails. The California mouse, Peromyscus californicus, which has similar distribution, is sometimes found living in woodrat dens. Dens contain a nest and one or more "pantry" chambers which are used to store leaves and nuts for future consumption. The dental formula of Neotoma fuscipes is 126.96.36.199 × 2 = 16. 
The species is found in Mexico and the United States. Woodrats are found from Oregon into the northern part of Baja California. They are found along the Pacific coast, west of the deserts and Great Basin.   Woodrats prefer dense chaparral and are found near streams. They are also found in juniper and mixed coniferous forests, they prefer dense ground cover. In northeastern California, woodrats can survive in lava rims and beds with enough vegetation cover. 
Dusky-footed woodrats are chiefly herbivorous, but will eat insects, especially mealworms and crickets if offered; they eat a variety of cuttings from branches, leaves, fruits, and nuts.  Woodrats store food cuttings in their nests; with nests averaging 4.5 species of herbivorous vegetation, though they tend to have a dominant food source making up the majority of cuttings, oak ( Quercus) is preferred if available.  While most woodrats are habitat generalists, eating many varieties of plants, there is evidence of local specialization in diets.  For example, significant differences have been observed in the diets of woodrats living only one kilometer apart, with one group living in juniper forest showing a preference for western juniper and the other, in mixed coniferous forest, substisting largely on incense cedar. 
Woodrats build extensive nests in trees, on the ground, and on bluffs with dense vegetation or rock cover. The conical shaped nests can be two to eight feet tall and are made of sticks, bark, and various plant matter. One nest can house successive generations of woodrats, with offspring adding to nests making them larger. The nests can have many rooms used for food storage, resting, nurseries, and protection. Nests can be built in harsh, inaccessible places such as thorny brush or poison oak patches.   One study suggests that dusky-footed woodrats of California have been found to selectively place California bay leaves ( Umbellularia) around the edges of their nest within their stickhouses to control levels of ectoparasites such as fleas.  The leaves contain volatile organic compounds which are toxic to flea larvae. Among the terpenes most toxic to flea larvae in the bay leaves are umbellelone, cineole, and cymene.  Wood rats are believed to have evolved this behavioral adaptation to cope with the environmental stresses posed by ectoparasites. 
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- Vassar College, URSI projects 2006 and 2007, Prof. Richard B. Hemmes and Edith C. Stout, Students Anna Payne-Tobin, Camille Friason, and Michael Higgins. The Role of Monoterpenes from California Bay in Nest Ectoparasite Control by Dusky-Footed Wood Rats Archived 2010-07-10 at the Wayback Machine, and Behavioral Adaptations to Parasites: Are Wood Rats Using Plant Essential Oils to Control Nest Ectoparasites? Archived 2010-07-10 at the Wayback Machine