[1] It has a smooth, glossy, grey or brown body with a milky-white clitellum,[2] and can range from 1.5 to 8 in (3.8 to 20.3 cm) in length.

[2] Amynthas agrestis is native to Japan and the Korean Peninsula, and was introduced to North America due to increased human activity during the 19th century;[3][4][5][6] it is considered to be an invasive species in the United States.

[8][9][10][11] One of the main concerns is their overconsumption of leaf litter, which impacts the microbial and species diversity of the native soil.

This method removes leaf litter, the main food source for the species, which should thoroughly control its overall population.

At least six months out of the year, it spends its time in the larval stage, then adults appear between May and June.