cliff swallow

cliff-swallow的词性：
n.（名词）

1. A North American swallow (Petrochelidon pyrrhonota) that builds a bottle-shaped nest of mud, grass, and twigs on the face of a cliff or bluff or under the eaves of a roof.
红石燕，崖燕：一种北美燕子（红石燕 鸲燕属） ，用泥、草及细枝在峭壁、陡崖表面或房屋屋檐下筑造瓶状巢穴