Tim they can come over the fences, jump up the wall of the creek that goes through the back yard. Over the gates on the north and south sides of the house. Access is endless. I am fortunate that they do very little damage. They don't seem to eat anything, just pull things up and drop them. We have a neighborhood cat that has been taking care of the rodent population. We make him feel at home. Even Suzie welcomes him.
Two different days I caught on video flocks of what looks like Starlings land on the beds. They will move the roller types around. That is one reason the rollers are place far from each other.
Rj, thank you for the suggestion. If they start to really damage things I will give the PlantSkydd a try. I know goldfinch4 uses it with great success.