gypsy moth; spongy moth
Refers to the moth species Lymantria dispar. The name 'spongy moth' is a newer common name adopted in some regions.
Gypsy moth larvae eat tree leaves.
There was a large outbreak of spongy moths this year.
Hiragana spelling, also common.
Rarely used kanji form.
The name likely derives from the caterpillar's movement resembling a dancing snail (舞舞 + 蛾). The exact origin is uncertain.