I have a family that visits my feeders several times per day. They don't sound an alarm when they see my cat only when the neighborhood bully cat shows up, then I come out and chase him away. We're a team. We have huge flocks here in Santa Cruz around the end of Oct - Dec. I've seen them feeding/foraging on large lawn areas in a residential area, and many of them have gathered on the telephone lines by my house and fly back and forth to some redwoods in a park 1/2 block away. There are lots of complaints online (Nextdoor) about the racket they make, but I love it. I've taken videos of them.
I live in Santa Cruz California. We have tons of crows around here. I don't remember seeing many at all 35 years ago. During the late fall, in our neighborhood, which includes a small park with some tall redwood trees, crows congregate in great numbers. There are other areas in town where this occurs also. They line up on the power lines across the street from my house. They stream overhead in great numbers to the land in the tall trees just a couple of houses from ours. They make a lot of racket and seem to be having a great time as more and more crows fly in to join the party. I have about 4 regulars whom have overcome their fear and sit on the fence waiting for me to put peanuts in the flat, hanging feeder. If the squirrels are there first, they wait until I chase them off. One or two of them know how to grab 3 to 4 peanuts at a time - a method which involves pushing the first peanut to the back of the throat. It's funny because there are 2 squirrels who will do the "3 peanut grab" also. I love the crows and think them handsome and intelligent.