What specific feature primarily differentiates the Stoat (*Mustela erminea*) from a true weasel?
Answer
The tail length relative to the head and body.
Although the Stoat (*Mustela erminea*) and the weasel are closely related small mustelids often confused, especially when the Stoat is in its winter white 'ermine' coat, a key proportional distinction lies in the tail. Generally, stoats possess tails that are significantly longer relative to their head and body combined—often measuring about one-third of that combined length. In contrast, true weasels typically exhibit tails that are shorter in proportion to their head and body length, although this comparison must account for species variations like the Long-tailed Weasel.
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