Many of those have been removed or replaced with treated wood, plastic, or metal posts. Not long ago, many bluebirds nested in wooden fence posts, especially around farms. Competition for these limited sites is a huge problem, especially in early spring. But today, natural cavities can be hard to find. In the natural world, all three species of North American bluebirds-the Eastern, Western, and Mountain Bluebirds-seek tree cavities or woodpecker holes for nesting sites. Barker and Elissa Wolfson. You can also download a printable PDF of the instructions here. This article has been adapted from the Audubon Birdhouse Book by Margaret A.
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