Where have all the swallows gone?

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Date: 2014-10-27 10:43:31 Tree Swallow Hirundinidae Bird migration Swallow Bird Ornithology Biology Hirundo Zoology Barn Swallow		Where have all the swallows gone? Add to Reading List Source URL: phys.org Download Document from Source Website File Size: 70,87 KB Share Document on Facebook

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