A baffle on the post beneath the box is about all you can do. Black snakes can drop from overhanging limbs. I'll never forget the time a black snake fell off the rafters in our old barn (when I was a teenager) and onto a mouse. If the area around the post is suitable (sun and dry), you could plant lavender there. Cameron

Yes, i hope so too, he did see one earlier in the season, he must have been househunting too and went elsewhere. Anyway, doesn't the female come a few days later and make her decision? seems I read that somewhere, .These houses are probably about 30 ft. apart too. I wish they would both move in! The blues in the new box, properly mounted and the swallows in the old box, mounted on an electric pole, where they lived the prior two years (I don't know if they were the same ones). thanks for your response.

Hi Dana. Bless your heart. Thank you so much for wanting to help the Bluebirds by buying a house for them. :o) Unfortunately, successfully hosting Bluebirds usually involves more than just erecting a house. I think that dzyg is trying to say that it would be best for the Bluebirds if everyone who erected a Bluebird house would take a little time to research them and their nesting preferences and to learn about how to offer the safest place that can be offered to them. The sialis website offers so much valuable information. It's a wonderful place to learn all about what you will absolutely need to know. The first thing you want to do is to learn about nest box placement to be sure that yours is properly placed and also has appropriate guards in place. Once you have accomplished that, you need to know about what can go wrong and what to do about it. House Sparrows (HOSP) are not native to this country and are not protected by federal laws. Thus, it is legal to remove their nests, eggs, chicks, and to trap and kill the adults. HOSPs cause so many problems for the Bluebirds that a Bluebird host really has to deal with them swiftly and diligently, never ever allowing them to nest inside any nest box. Even if the only thing you do is to plug up the hole to prevent the HOSPs from entering the box, that is doing something good for the Bluebirds. Once a male HOSP has laid claim to a box, it is really really hard to deter him. If you close it and wait patiently though, he will eventually move on. Of course, you may miss out on a chance to have the Bluebirds nest as a result. Still, that is better than allowing the HOSP to have the box. Bluebird pairs will raise 2-3 broods per year, so you still have plenty of time. If you can deter or eliminate the HOSP, and the Bluebirds build a nest in your box, you can place a "Sparrow Spooker" onto the box to deter the HOSPs. The sialis site tells you about those, and they can be purchased or made easily at home. I hope that helps you, and please feel free to e-mail me privately if you want to.~~Angie Here is a link that might be useful: Sialis/ Advice for New Bluebirders

My best guess would be that the tree swallows built a nest somewhere else and it was taken over. I've seen a bird lay an egg in an empty box once before. Tree Swallows are limited in their time to lay since they are neotropical migrants, and have to get back to South America. I wonder if you could put a fake nest under the egg so the babies have a better chance of survival?