Our local Riverwalk has people, dogs, children, bicycles, etc constantly and the Bluebirds nest along the trail. There are tons of boxes. It is actually a trail IN HONOR OF or IN MEMORY OF and they are successful every year. I do believe bluebirds are more tolerant of people than other birds. Sometimes I am out on my patio and the bluebirds will fly in to the dogwood and chatter until I feed them. I also have a friend who has hand fed adult bluebirds in her yard in the past. They get use to you………I call mine in every morning and they come just clockwork.
Lexi
Virginia