初しょ鳴めい日び

noun

first day of singing/chirping (for a species in a given year)

Technical term used in phenology and nature observation; refers to the first date in a calendar year when a particular bird, insect, or other singing animal is heard. Often contrasted with 終鳴日 (last day of singing).

See also: 終鳴日

• 今年ことしのウグイスの初しょ鳴めい日びは3月がつ15日にちだった。

  The first day of singing for the Japanese bush warbler this year was March 15th.

• 気き象しょう庁ちょうは桜さくらの開かい花か日びだけでなく、セミの初しょ鳴めい日びも観かん測そくしている。

  The Japan Meteorological Agency observes not only the cherry blossom blooming date but also the first day of cicada singing.