Good morning! We must have bluebird babies in one of my bluebird houses! I've seen the male going in and out of the house...it could also be the female inside sitting on the eggs. Anyway, Kenzie can smell them and keeps standing up on the fence and trying to stick her big nose in the hole in the house...thankfully, her big nose doesn't fit! I had some garden fencing set aside and fenced off the bluebird house. No more big nose bugging my bluebirds! Have a great day!