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：2025/11/29
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Any of various birds in the genus Petrochelidon that nest in cliffs.
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cliff swallow
A cliff swallow perched on a sun-warmed ledge, its mud gourd of a nest tucked into a crevice where the colony returned each evening.
See correct answer
A cliff swallow perched on a sun-warmed ledge, its mud gourd of a nest tucked into a crevice where the colony returned each evening.
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