We love the Tree Swallows that have faithfully have nested in our Tree Swallow house every year since we had put it up. My daughter had named our bird house "Swallow Swoop Inn.", when we put it up on a pole attached to the end of out garage roof several years ago.
The birds have most always been friendly swooping over our garden and yard each year. That is until last year, for then, last spring, when they seemed to take offence and were a bit hostile in their behaviour towards my husband while he worked in our garden, and they would swoop in and fly into his face. I had posted about this problem last year and had posted a picture of my husband holding a plastic flower pot over his head to protect himself. You can see and read about it here;http://naturetales.blogspot.com/2010/06/tree-swallow-feeding-time.html
This year the Tree Swallows have returned, but have been slow in taking up residence in the bird house. , probably due to the very rainy weather we have been having this spring. Yesterday a couple of swallows were checking out the premises and one went inside the bird house to inspect it. Perhaps they are ready to move in soon.
However we are planning on putting a new roof on our garage where the bird house is attached on the top of a long pole. Out contracter is coming today to appraise the job. And when seeing the Tree Swallows yesterday, My husband recalled their aggressive behaviour last spring and as he stared, "We have to move the bird house". I do hope the birds will adapt to the new location of the bird house. I do not want their yearly visitations to be interrupted. I will keep you posted as to how it is working out.