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Cornell Labs has several good resources: Cornell Lab of Ornithology, Exploring and Conserving Nature. The Sibley app also has bird sounds you can compare to (as do several other mobile apps): Sibl...
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Cornell Labs has several good resources: Cornell Lab of Ornithology, Exploring and Conserving Nature. The Sibley app also has bird sounds you can compare to (as do several other mobile apps): Sibl...