I've only seen one and it was at least 20 years ago in the Northern Sacramento Valley. One of my daughters cats had one treed up on a ladder that was against the house.
I'd heard barking out by the back porch so flipped on the light and opened the screen door and the little bugger was making a hoarse barking noise on the top of the ladder three feet away. Got the cat to leave it alone and it wandered back into the orchard.
