Stoat (Ermine) (Mustela erminea)

MammalMustelidNorthern

Overview

The stoat (Mustela erminea) is a small, slender, and famously bold member of the weasel family (Mustelidae), also known as the short-tailed weasel and — in its white winter coat — the ermine. It has a long, low-slung body, a brown back and pale belly in summer, and a black tip to the tail that it keeps year-round, even when the rest of the coat turns white.

Despite its small size, the stoat is a determined and effective predator, capable of killing prey considerably larger than itself, and it ranges widely across the cold north of the world.

Conservation note: stoats are widespread and generally common in their native range, but where introduced (notably New Zealand) they are a serious invasive predator of native birds. Verify status and regional context at authoritative sources.

Habitat & Range

Stoats live across northern Europe, Asia, and North America, in a wide range of habitats — woodland, grassland, moorland, farmland, marshes, and mountains — wherever there is cover and prey. They are well adapted to cold climates and are found from lowlands to high altitudes and far north.

Diet

Stoats are carnivores that feed heavily on small mammals, especially rodents and rabbits, along with birds, eggs, and other small prey. They are renowned for tackling animals such as rabbits that are much bigger than themselves, killing with a precise bite. Their high-energy lifestyle means they must hunt frequently.

Behavior

Stoats are active, curious, and largely solitary hunters, moving with a bounding gait and investigating burrows and crevices for prey. In colder regions their coat moults to white in winter (the ermine), providing camouflage in snow, while the tail tip stays black. They are agile climbers and swimmers, and some have been observed using distracting movements while hunting.

Human Interaction & Conservation

Ermine fur — the stoat's white winter coat with its black tail tip — has a long history in ceremonial robes and heraldry. Ecologically, stoats help control rodent numbers in their native range. However, where they have been introduced, such as in New Zealand, they are a damaging invasive predator of vulnerable native birds and are subject to intensive control. Consult authoritative sources for current status.

More photos of the stoat (ermine)