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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.
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 ...
Neogale contains four species: the Amazon weasel (Neogale africana), the long and short-tailed weasels (N. frenata and N. lontra), and the American mink (N. vison). Native to the Americas , members of the genus can be found as far north as Alaska and as far south as Argentina and Bolivia .
Long-tailed weasel, Neogale frenata American mink , Neogale vison The sea mink ( Neogale macrodon ) is a recently extinct species from the 19th century that was native to the Maritime Provinces of Canada and New England in the United States .
Common guillemots, one in bridled form (with "spectacles"), and one Brünnich's guillemot (U. lomvia, with white-marked bills) from the genus Uria Black guillemot (C. grylle) from the genus Cepphus Common guillemot in bridled form, a white circle around the eye with an extension backwards suggesting they are wearing spectacles