営巣

1. Origins, structure, and basic meaning

• Structure: The spelling is 営巣, read えいそう, and it combines 営, meaning establish or carry on, with 巣, meaning nest.
• Basic usage: The basic sense of 営巣 is nesting: an animal building a nest and using it as a place for breeding or living.

2. Common pitfalls and similar expressions

• Nesting activity and nesting location
  • The forms are 営巣する and 営巣場所. The first describes the activity of nesting, while the second is a compound naming the place where it occurs.
• Seasonal behavior and a pre-construction check
  • 春になるとツバメが軒下で営巣する。 — Swallows nest under the eaves in spring.
  • 工事前に鳥の営巣場所がないか確認した。 — Before construction, we checked whether there were any bird nesting sites.