Mosquito eaters returned toOregon's Willamette Valley yesterday.
Now I know it's spring. Yep, the tree swallows have returned.
Anyway, if anybody is interested in providing some housing for these birds, here's a link to some free plans. I modified my houses by making one side panel hinged for easy clean-out. I used nails as hinges on the upper part of the panel, drilled a hole through the bottom that I could peg with a nail to keep it closed.
http://www.choosefreedom.com/birdhouse.html
Swallows seem to prefer a house hung at least 5 feet above the ground, an open flyway, and the opening of the house facing either east or southeast. Give 'em a condo, and enjoy the show.