Petrochelidon

Petrochelidon is a genus of birds known as cliff-nesting swallows. The genus includes all of the five species of birds commonly called cliff swallow, and contains the following species:

单词	Cliff Swallow
释义	Cliff Swallow 英语百科 Petrochelidon Petrochelidon is a genus of birds known as cliff-nesting swallows. The genus includes all of the five species of birds commonly called cliff swallow, and contains the following species:
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Cliff Swallow

Petrochelidon