I talked to my niece Amber. She is surveying Fisher, a long-tailed, boreal member of the weasle family about the size of a large racoon with a long tail. Fishers are dark brown. They occur, rarely, in the High Sierra.
I used to see them in Northwest Montana, a transplanted population that ate a lot of Porcupines. They were in the Bunker Creek area of the South Fork of the Flathead River. Like the Wolverine, they are agile and fast and suprizingly large.
I hope Amber is able to locate Fishers in California. She has her work cut out for her!