The red fox, on the other hand, is the size of a large cat or medium-sized dog. It stands about 1.3 ft at the shoulder and weighs only 31 lbs. That means the gray wolf is six times the fox’s size!

Unfortunately there are very few Sierra Nevada red foxes left. They’re among the rarest mammal species in North America. Already highly vulnerable to extinction due to their perilously small ...

These foxes are jeopardized by inbreeding depression due to small population size and hybridization with nonnative red foxes. Disturbance from humans, particularly from snowmobiles, is also a threat.