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The Bluebird population has declined greatly in North America and many people want to help reverse this trend by attracting these lovely birds to their yards. One way is to provide them with a nesting spot. While there are many Bluebird houses available for purchase, a DIY approach is an economical and fun option as well! Bluebirds build delicate cup shaped nests made up of fine grass, pine needles and feathers. They prefer open areas that have low growing vegetation such as pastures, mowed lawns and cut fields rath