2019 年 26 巻 p. 69-71
While birdwatching in Mt. Koma I heard a familiar bird singing but I could not immediately recognize which bird it was. Unfortunately I did not have a voice recorder so I took a video with the camera indicated above. Later, I extracted the audio file from the video and handed it to Mr. Michio Matsuda for an evaluation. Mr. Michio Matsuda confirmed that it was the voice of a Black-Naped Oriole.