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Cornell Lab of Ornithology: David Examining Nestbox
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Cornell Lab of Ornithology: Tree Swallows on Nestbox
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Cornell Lab of Ornithology: Students Working on Tree Swallow Project
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Cornell Lab of Ornithology: David's Tree Swallow Farm
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Cornell Lab of Ornithology: David Checking Nestbox
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Cornell Lab of Ornithology: Tree Swallow Bringing Feather to Nestbox