I've seen three owls. The first one was sitting on a fence in Carmel, CA. At the time I didn't know what kind it was. A few years ago a Great Horned Owl sat on the roof of the house across the street, in the SF Bay Area. It was there for at least 24 hours. And we had a Western Screech Owl stay in our Flicker bird house for a couple of days, in Central Oregon.
Here in Albany,CA we haven't seen the roosting area but starting this fall have observed crows flying, we presume, to a roost. It occurs about half an hour before sunset and takes about 10/15 minutes for all the crows to fly by. They are usually in groups of 4/5 to 15 or more. I would guess there are upward of 80 to 100 crows altogether. Fascinating to watch!
We have been feeding scrub jays peanuts for years. The crows in our neighborhood (SF Bay Area) discovered this and began coming around when they saw the jays come to get their peanuts. We never gave the crows peanuts and it was rare that they got any. The jays seemed to be able to hold their own against the crows. Recently several crows have discovered our bird bath. They spend a great deal of time in it. Also, I have found spent peanut shells in it, as maybe they are washing them first? I've also found long strands of grass in the bird bath.