"The Sonoma Tree Vole nests so high in trees that finding one in a forest interior is quite difficult, and many records are from individuals that were living in trees that were cut down. A few coniferous tree species provide all of the Sonoma Tree Vole's food. The animal may eat an average of about 2,400 needles per day, taking them from young, terminal twigs and consuming only the outer part of each needle. Although one large tree may have several nests, each nest will usually contain only one Vole. Litters are small—often only one or two young—and the young develop slowly, not leaving the nest until they are a month old. The animal's distribution is limited to the coast of northern California, where it is common."
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Original description: Johnson, M.L., and S.B. George, 1991. Species limits within the Arborimus longicaudus species-complex (Mammalia: Rodentia) with a description of a new species from California. Contributions in Science (Los Angeles), 429:12.