noun
common house martin
A migratory songbird, Delichon urbicum, known for its mud nests on buildings. In Japanese, the name is usually written in katakana as ニシイワツバメ.
ニシイワツバメは春になるとヨーロッパから渡ってくる。
The common house martin migrates from Europe in spring.
あの建物の軒下にニシイワツバメの巣がある。
There is a common house martin's nest under the eaves of that building.
The Japanese name ニシイワツバメ literally means 'western rock swallow,' referring to its nesting habits and western origin. The exact derivation is uncertain, but it is a descriptive compound.