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External super sound is very efficient to bring in swiftlet . because the super sound have an surplusage to bring in swiftlet. with this super sound , many bird house had success in short time. Super Internal Sound Internal Super Sound is a important sound to stimulate swiftlet to stay/live in our bird house. The influence of the bird sound is so great. without a beautiful sound , swiftlet difficult to stay in bird house. So the Sound will become a role become futile , because external sound already bring in many birds but the internal sound has no function. you can watch this video the internal birdsound effect .
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