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Vital clues shed light on avian migration routes

In late spring, Yuan Xuejun, who works in an office near the Zhengyang Gate in Beijing, loves hearing the sharp, clear notes of birds in the sky.

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Global experts reveal migration routes of Beijing swifts

BEIJING, July 5 (Xinhua) Chinese and foreign researchers have for the first time revealed the migration routes and phenology of Beijing swifts, publishing th

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