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a family of small or medium-sized predatory mammals. The fur is thick and fluffy, with a fine, soft undercoat. These animals generally have an elongated and flexible body and a bushy tail. The claws are not retractile, and in many species the digits are webbed. Special anal glands release a fetid secretion. Mustelids are distributed throughout the world except for Australia, the antarctic, Madagascar, Iceland, and some small islands. There are five subfamilies, with 28 or 30 genera. Sixteen species, making up eight genera, are found in the USSR.

Short-tailed, or snow, weasels (Mustela nivalis), polecats, and martens—all of the subfamily Mustelinae—are active predators. Feeding primarily on mammals and birds, they have molars with sharp cutting ridges. These species are terrestrial, and some are good tree-climbers. Badgers of the subfamily Melinae have digits with strong claws adapted for digging burrows. Feeding on animal and vegetable food, they have molars with broad, flat crowns that serve for grinding food. The common otter and the sea otter, which are both of the subfamily Lutrinae, are aquatic mammals, with well-developed swimming webs. These otters feed on fish, mollusks, and other aquatic animals.

Almost all mustelids are commercially valued for their fur (especially sable and sea otter).


Ognev, S. I. Zveri SSSR i prilezhashchikh stran. (Zveri Vostochnoi Evropy i severnoi Azii), vol. 2. Moscow-Leningrad, 1931.
Mlekopitaiushchie Sovetskogo Soiuza, vol. 2, part 1. Edited by V. G. Geptner and N. P. Naumov. Moscow, 1967.
References in periodicals archive ?
Identification of mustelids using mitochondrial DNA and non-invasive sampling.
The only fossil mustelid reported previously from Michigan was Martes americana, the marten, from the Holocene Sleeping Bear Dune locality (Pruitt 1954), so the Mill Creek specimen is the first record of a fossil Mustela weasel from Michigan.
Ferrets belong to the Mustelid family of mammals which includes weasels, stoats, polecats and badgers.
They belong to the mustelid family, which includes carnivores that have anal scent glands.
Two mustelid species can coexist when rodent populations are high.
Dayan and Simberloff (1994) cite numerous references for European mustelid species showing dietary differences between the sexes.
The close correlation of pesticide use and the rapid decline of mustelid populations in Nebraska could easily indicate cause and effect in the decrease of these furbearers.
In laboratory studies on wild mammals, perception of increased predation risk in red-backed voles (Clethrionomys rutilus) by exposure to mustelid odor has been found to depress embryo growth (Ylonen et al.