Every year have had the Eastern Bluebirds build in our backyard. Out of three houses, two pair bluebirds will take two of them and the last one always will be with pair of tree swallows.
I used a tall shrub for my hide and also used my cable release cord to give me even greater distance which was sucessful.
This is the female with a green caterpillar for her young. Both male and female continue to take turns feeding almost non stop.