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Song sparrows, cedar waxwings, black-capped chickadees, Townsend's warblers flit in foliage. That the juvenile birds approached the simulated interaction of two song sparrows but largely ignored the solo singing of a song sparrow lends support to the social eavesdropping hypothesis proposed by Beecher. Thanks to the miracle of modern electronics, tags weighed only about 4 percent of the weight of a song sparrow. |
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