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Someone or something that whistles, or who plays a whistle as a musical instrument.
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Any of several passerine birds of the genus Pachycephala, of Australasia and the western Pacific.
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Any bird that whistles or is noted for its whistling vocalisations (applied regionally to various specific species).
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The goldeneye (certain ducks of genus Bucephala).
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The whistling marmot (Marmota caligata).
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The mountain beaver (Aplodontia rufa).
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An audio-frequency electromagnetic wave produced by atmospheric disturbances such as lightning.
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A broken-winded horse.
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The keeper of a whistling shop, or shebeen.