Cliff swallows abandoned the California town they once filled every spring, then people came together to rebuild their homes and welcomed them back with an annual festival

For centuries, the arrival of thousands of cliff swallows transformed the skies above a small California town into one of America's most celebrated wildlife spectacles. Every spring, the agile birds returned almost like clockwork after migrating from South America, filling the air with their distinctive chatter as they rebuilt their mud nests around the historic mission.

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