I've been watching our resident Bluebirds for a couple of weeks. I noticed they were both making numerous trips to and from the nesting box so I located a chair, my camera, tripod and me near the corner of the house. The female was really cautious and wouldn't go to the box for quite a while. It took a while but both birds started coming back to the nest. The male actually went to the opening first.
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After a short while, I decided to leave as they were really nervous about me even though I was 30 feet away.