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What sound does a loon make? Or a chickadee? Find out using the Cornell Lab of Ornithology's Macaulay Library, a "collection of biodiversity media with more than 175,000 audio and 60,000 video recordings documenting the behavioral diversity of birds and other animals." Search is by species or catalog number; tips for seaching can be found on the Library's website. And, for serendepity, check out the staff picks.