Key to species of Genus Mustela in Korea

1 Head-body length <200 mm; tail length 30 mm ....................................................... M. nivalis

- Head body length> 150 mm; tail length> 30 mm ............................................................. 2

2 limbs and tip of tail black.................................................................... M. eversmanii

- limbs and tail yellow................................................................................... 3

3 Head-body length> 275 mm; tail length 50% head-body length; lips and chin white enclosed by dark pelage on face.................................................................................................... M. sibirica

- Head-body length <275 mm; tail length 33% head-body length; no dark pelage on face....................... M. altaica