American ermine
The American ermine or American stoat is a species of mustelid native to most of North America. The specific epithet refers to Arctic explorer and naturalist John Richardson.
Description
The American ermine has a body plan typical of weasels. It has short legs, a long body and neck, and a small triangular head with short round ears. It has a brown dorsum with a white venter and a short, black-tipped tail.Taxonomy
It was long considered conspecific with the stoat, but a 2021 study found it to be a distinct species, forming distinct genetic clades from erminea. The finding has been accepted by the American Society of Mammalogists. The Haida ermine is thought to be a hybrid species originating from ancient hybridization between M. erminea and M. richardsonii.Distribution
The species is found throughout most of North America aside from most of Alaska, eastern Yukon, most of Arctic Canada, and Greenland, where it is replaced by M. erminea. It reaches the northern extent of its range in Ellesmere Island and a portion of eastern mainland Nunavut and ranges from here to cover almost all of western North America south to northern New Mexico, and eastern North America south to northern Virginia. It is absent from most of the Southeastern United States and the Great Plains.Diet
In North America, where the ecological niche for rat- and rabbit-sized prey is taken by the larger long-tailed weasel, the American ermine preys on mice, voles, shrews, young cottontails, chipmunks, deer mice, jumping mice, and house mice. Usually the ermine kills by biting at base of skull. Small birds, frogs, small fish, and earthworms are other types of prey for ermines.Habitat
Ermines live and find cover from predators in hollow spaces in logs, burrows and man-made structures. Ermines sometimes den within their prey's nest, and use their prey's skin and fur as a lining for their den.Breeding
They breed in dense parts of the forest. The season for breeding is late springtime to the summer from July to August. The males mature in a year while the females only take three to four months to mature. The females carry a litter of four to seven babies for 255 days then gives birth.Predators
Some of the larger wild predators of ermines are minks, martens, fishers, bobcats, coyotes, and large owls and hawks. Occasionally a domesticated cat or dog may kill an ermine. Their small agile bodies help them evade these predators, while also allowing them to compete with their predators for food in more barren months.Subspecies
About 13 subspecies are known:| Subspecies | Trinomial authority | Description | Range | Synonyms |
| Junean stoat M. r. alascensis. | Merriam, 1896 | Similar to M. r. richardsonii, but with a broader skull and more extensive white tips on the limbs | Juneau, Alaska | |
| Vancouver Island stoat M. r. anguinae | Hall, 1932 | Vancouver Island | ||
| Western Great Lakes stoat M. r. bangsi | Hall, 1945 | The region west of the Great Lakes | cicognani pusillus | |
| Bonaparte's stoat M. r. cigognanii | Bonaparte, 1838 | A small subspecies with a dark brown summer coat; its skull is more lightly built than that of richardsonii. | The region north and east of the Great Lakes | pusilla vulgaris |
| M. r. fallenda | Hall, 1945 | |||
| M. r. gulosa | Hall, 1945 | |||
| M. r. initis | Hall, 1945 | |||
| M. r. invicta | Hall, 1945 | |||
| Southwestern stoat or New Mexico ermine M. r. muricus | Bangs, 1899 | The smallest subspecies of richardsonii. | The southwestern extremity of the species' American range | leptus |
| Olympic stoat M. r. olympica | Hall, 1945 | The Olympic Peninsula, Washington | ||
| Richardson's stoat M. r. richardsonii | Bonaparte, 1838 | Similar to M. r. cigognanii, but larger, with a dull chocolate brown summer coat | Newfoundland, Labrador and nearly all of Canada | imperii microtis mortigena |
| Baffin Island stoat M. r. semplei | Sutton and Hamilton, 1932 | Baffin Island and the adjacent parts of the mainland | labiata | |
| M. r. stratori | Merriam, 1896 |