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Mustela sibirica
Rare visitor: recorded only occasionally in this country
Diet
Mostly rodents; also birds, insects, amphibians, reptiles, fruit and seeds
Habitat
Lowlands and mountains, including settled areas
Range
Northern and eastern Asia, including North and South Korea
The Siberian weasel is a medium-sized mustelid with an elongated body, short limbs, a narrow head and a tail about half as long as its body. The winter coat is dense and generally yellowish brown to reddish ochre, with paler underparts and a darker facial mask; summer fur is darker. Its relatively even colouring distinguishes it from more strongly patterned polecats (Abramov et al. 2018; Wikipedia, general species account).
Rodents form the main prey across much of the range, although the diet can also include birds, amphibians, fish, eggs, insects, fruit and seeds. The species occurs from lowlands into mountains and may live around settlements, with local studies showing considerable flexibility in prey choice (National Institute for Environmental Studies; Abramov et al. 2018). Its documented Asian distribution includes both North and South Korea (Mammal Diversity Database v2.4).