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Skulls of a long-tailed weasel (top), a stoat (bottom left) and least weasel (bottom right), as illustrated in Merriam's Synopsis of the Weasels of North America. The long-tailed weasel is the product of a process begun 5–7 million years ago, when northern forests were replaced by open grassland, thus prompting an explosive evolution of small, burrowing rodents.
The Indonesian mountain weasel (Mustela lutreolina) is a species of weasel that lives on the islands of Java and Sumatra in Indonesia at elevations over 1,000 metres (3,300 ft). They live in mountainous, tropical, and rainforest areas.
Six extant mustelid genera left-to-right, top-to-bottom: Martes, Meles, Lutra, Gulo, Mustela, and Mellivora Mustelidae is a family of mammals in the order Carnivora, which includes weasels, badgers, otters, ferrets, martens, minks, and wolverines, and many other extant and extinct genera.
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Sthenictis sp. (American Museum of Natural History). Mustelids vary greatly in size and behaviour. The smaller variants of the least weasel can be under 20 cm (8 in) in length, while the giant otter of Amazonian South America can measure up to 1.7 m (5 ft 7 in) and sea otters can exceed 45 kg (99 lb) in weight.
In the UK, the term "weasel" usually refers to the smallest species, the least weasel (M. nivalis), [1] the smallest carnivoran species. [ 2 ] Least weasels vary in length from 173 to 217 mm ( 6 + 3 ⁄ 4 to 8 + 1 ⁄ 2 in), [ 3 ] females being smaller than the males, and usually have red or brown upper coats and white bellies; some populations ...
Mustela sibirica. COVID-19 can infect both the European mink (Mustela lutreola) and the American mink (Neogale vison).Ferrets are used to study COVID-19. [5] Ferrets get some of the same symptoms as humans, [6] but they get less sick than farmed mink. [7]
The Siberian weasel builds its nest inside fallen logs, empty stumps, brushwood piles and exposed tree roots. It also uses and enlarges the dens of other species. The length of its burrows ranges from 0.6–4.2 m (2 ft 0 in – 13 ft 9 in) and 0.2–1.3 m (7.9 in – 4 ft 3.2 in) deep.