The San Diego Desert Woodrat (Neotoma lepida) is a small species of pack rat native to desert regions of western North America, ranging from southeastern Oregon and southwestern Idaho (USA), south to Baja Califonia and extreme northwestern Sonora, Mexico.This pack rat is 8.5 to 15 inches long. Their coloring is a pale gray with light undersides, but the fur on the throat region is gray at its base, the tail is distinctly bicolored.