What specific anatomical feature characterizes the Long-tailed Weasel (*Mustela frenata*) compared to the Least Weasel?
Answer
A very long tail relative to body size
The differentiation between species within the genus *Mustela* often relies on subtle yet consistent morphological ratios and ecological adaptations. The Long-tailed Weasel (*Mustela frenata*) is specifically identified by having a tail that is markedly long in proportion to its overall body length. This elongated tail is noted as aiding significantly in balance, especially crucial during its active hunting pursuits. In contrast, the smaller *Mustela nivalis* has a shorter proportionate tail. This difference in tail length ratio is a practical metric used in field biology to distinguish between these two closely related species inhabiting overlapping geographic ranges.
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