grass cricket
A small cricket found in grassy areas, known for its soft chirping. Often associated with autumn in Japanese culture.
On autumn nights, you can hear the chirping of grass crickets from the thicket.
Compound of 草 (kusa, 'grass') and 雲雀 (hibari, 'skylark'), likely from the insect's grass-dwelling habit and its chirping resembling a lark's song.