What is the smallest of the four main islands of Japan where the Acronicta digna moth can be found?
Acronicta digna: Acronicta digna is a moth of the Noctuidae family. Acronicta digna:  It is found in the Korean Peninsula, China, Japan (Honshu, Shikoku, Kyushu), the Russian Far East (Primorye, southern Khabarovsk, Amur region) and Taiwan.
i don't know