Question: What is the smallest of the four main islands of Japan where the Acronicta digna moth can be found?
Sentence (from "Shikoku"): Shikoku (四国 , "four provinces") is the smallest (225 km long and between 50 and wide) and least populous (3.8 million as of 2015 ) of the four main islands of Japan, located south of Honshu and east of the island of Kyushu.
Relevant evidence: Yes