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Ferret
Compare everything else with the domestic ferret first. Look for a long body, short legs and a tapering tail. Domestic coats range from pale to dark and a mask can be strong, faint or absent. Body shape will be more reliable than color when comparing photos.
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European polecat
This wild relative has a pale band on its muzzle and a dark mask around the eyes. A dark domestic ferret can look very similar, so a photo of the face alone may not identify one confidently. The polecat is a good comparison to make in Europe.
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Black-footed ferret
Dark feet, a dark mask and a black tail tip stand out against a pale coat. The species spends much of its time around prairie dog burrows in North American grassland. It is a wild animal with a more consistent coat pattern than a pet ferret.
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Steppe polecat
This open-country polecat resembles a pale ferret. Look for a sandy back over a pale undercoat, with much darker feet and a dark tail tip. It lives in grassland and steppe across a broad stretch of Eurasia.
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Stoat
A stoat, also called an ermine, can look like a very slim ferret running close to the ground. The black tip of the tail is a useful clue. Where its winter coat turns white, that dark tail tip stays visible.
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Least weasel
A least weasel has the same long, low outline on a much smaller body. In a clear view, the short tail lacks the dark tip expected on a stoat. Look for the sharp boundary between dark back and pale belly on a brown individual.
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Long-tailed weasel
A slim shape and short legs can suggest a ferret until you see the tail. It is long and slender with a dark tip. In the Americas, compare that tail alongside the pale belly before calling a brown individual a stoat.
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Mountain weasel
This small Eurasian weasel has a light face and pale underside. Its narrow body and relatively small head give the silhouette of a particularly slender ferret. The open, rocky high country of central and eastern Asia helps place it.
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Siberian weasel
A rich yellow-brown coat and pale muzzle identify many Siberian weasels. A ferret can have a similar slinking shape, but the bright, more even color along the back is worth checking when comparing East Asian photographs.
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Japanese weasel
The Japanese weasel can have a rusty orange-brown coat, pale patch around the mouth and a body much narrower than most pet ferrets. Look at the tail and location too, because color alone can overlap with other East Asian weasels.
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American mink
Look for a sleek dark coat, a white patch on the chin and a furry dark tail. A mink moving along a pond or stream can look like a dark ferret. The frequent association with water helps you narrow down a sighting in North America.
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European mink
The white usually extends around both lips on a European mink. That muzzle is worth checking against a dark ferret or an American mink. A look along the banks of streams and marshes makes more sense for this species than an open field.
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Marbled polecat
The size, legs and mask recall a ferret until you look at the back. A marbled polecat has an irregular yellowish pattern over dark fur and a bushier tail. Its markings are more broken up than the coat of a typical pet ferret.
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Striped polecat
This African mustelid is also known as a zorilla. It has a ferret-like outline and a pointed face, but the bold white stripes down its dark back and the long, bushy tail give it a look of its own.
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African striped weasel
A very long body and low legs make this a closer match for a weasel than for a stocky skunk. Look for a pale top to the head, pale back stripes and a white tail. Its shape helps distinguish it from the larger striped polecat.
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Greater grison
The long body and short legs can suggest a ferret. Look for the pale line between its grizzled back and dark face and underside, and a shorter tail. Greater grisons live in tropical parts of the Americas, far from the grasslands where a black-footed ferret belongs.
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Lesser grison
A lesser grison has the same low outline and contrasting back and belly as other grisons. Look for the pale band over a dark face and the fairly short tail. Location helps with grison identification, especially in southern South America where this species is widespread.
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American marten
A marten shares the long body but has larger rounded ears, a fuller tail and a pale throat patch. See it moving on a branch and the difference is easier to place. It often uses trees and forest cover.
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European pine marten
A pale patch on the throat and a full tail are easier to see than the body shape on a quick woodland sighting. Pine martens also have larger, more prominent ears than ferrets. Compare those features before relying on the dark brown coat.
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Beech marten
Also called the stone marten. The longer, fuller tail and taller ears set it apart from a ferret. A pale bib runs down its throat and can divide toward the front legs. Its habit of turning up around buildings can provide another clue.
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Sable
A sable has a low mustelid body but a thicker coat and more prominent ears and tail than a pet ferret. Coat color varies, so use the combination of its build and a northern Eurasian forest location before relying on a dark coat.
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