The Silence of the Birds

The Silence of the Birds

John Terborgh, in Scientific American (May 1992), 415 Madison Ave., New Of the Birds York, N.Y. 10017.

The trills and calls of thrushes, warblers, tana- gers, and other favorite American songbirds are heard less frequently in many cities and sub- urbs. A decline of the songbird population has been under way for decades. the 1970s, for example, the number of breeding birds in Rock Creek Park, in Washington, D.C., was only about one-third what it was in the 1940s, and species that bred there but w...

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