I think this Male Eastern Bluebird has resorted to using food to attract a female to the birdhouse. I shared a few photos a couple of days ago where he was using nesting material to attract her to the birdhouse (Male Eastern Bluebird Bringing Nest Material To Birdhouse). If you look at the last photo below, I’m thinking it may have worked.
I’m not sure what the food is that he has, but he took it into the birdhouse and left it. He may have eaten it while inside the birdhouse, but he came out without it. I have seen the males using nesting material, but this is the first time I have seen one using food if this is what he was doing. What do you think?
Here are more photos of these Bluebirds: Male Eastern Bluebird Perched On Rain Gauge
Eastern Bluebird Nest Facts
After a male Eastern Bluebird has attracted a female to his nest site (by carrying material in and out of the hole, perching, and fluttering his wings), the female does all the nest building. She makes the nest by loosely weaving together grasses and pine needles, then lining it with fine grasses and occasionally horse hair or turkey feathers.
Bluebirds may use the same nest for multiple broods.
When given the choice in one study, bluebirds seemed to prefer snugger nest boxes (4 inches square instead of 6 inches square on the bottom) with slightly larger entrance holes (1.75 inch rather than 1.4 inch diameter). (All About Birds)