This is a very busy bluebird house. We had three broods last Summer. This year we are already working on the second brood. Momma is sitting on these eggs right now as I'm posting this. She is usually in there in the mornings and evenings. I love being able to watch the progression of this. The bluebird house is in plain view from my studio window (where I spend a lot of time), so when Mom and Dad start bringing food, I'll know these latest four eggs have hatched.