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colony, you will understand. If you are dealing with trees that are 60 or 70 feet tall, then the 60-foot number may not even be enough. Each situation has to be evaluated on its own merits. Do not place the site too far away from human housing. Try - to keep predators away. Martins drink and bath in the air. Therefore, your chances to attract them improve if there is clean, open water near the site, within a halfmile if possible. But
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