Democracy Dies in Darkness
Environment

North American birds are dying off faster. It signals a human crisis, too.

The dying songs of once-common birds are a bellwether of a deeper biodiversity crisis, researchers say.

American crows in the Los Angeles community of Pico Rivera. (David McNew/Getty Images)

With every passing year, the springtime chorus grows quieter. There are fewer song sparrows cheeping amid the shrubs and grasses. The high-pitched trill of the indigo bunting is muted. Even the raucous calls of American crows are fewer and further between.

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