益えき鳥ちょう

noun

beneficial bird

A bird that is useful to humans, such as by eating pests or pollinating plants. Often contrasted with 害鳥 (がいちょう, harmful bird).

• ツバメは益えき鳥ちょうとして昔むかしから大たい切せつにされてきた。

  Swallows have long been valued as beneficial birds.