Now the foxes remain in two small California populations: one near Lassen Peak, with likely fewer than 20 known foxes, and a second near Sonora Pass on the Humboldt ... BREEDING: Sierra Nevada red fox ...

According to the park, the Sierra Nevada red fox is one of the rarest mammals ... in an area north of Yosemite called Sonora Pass. Before that, biologists had not seen a fox in the region for ...