Japanese Bush Warbler ウグイス（鶯、鴬）

ウグイス（鶯、鴬、学名: Horornis diphone）
英語名：Japanese Bush Warbler

Japanese Bush Warbler

Cettia; Family: Cettiidae Order:Passeriformes

The Japanese Bush Warbler (鶯, Uguisu), Cettia diphone, is a passerine bird more often heard than seen. Its distinctive breeding call can be heard throughout much of Japan from the start of spring (wikipedia).