Yellow-billed Cuckoos (Coccyzus americanus) are fairly common in the eastern U.S. But in the last half-century, they have become rare in the West. Over the past 10 years in San Diego County, eBird shows unique sightings only 15 times—almost always a single bird in June or July, at Lake Henshaw, Lake Hodges, the Anza Borrego…

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