Use 'vulpine' to describe traits specific to foxes, especially their physical appearance. The detective had a vulpine nose, sharp and slightly upturned.
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Not Literal
'Vulpine' is often used metaphorically rather than describing an actual fox. Her vulpine grin gave away her cunning plan.
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Wildlife Context
When discussing wildlife or natural habitats, 'vulpine' can refer to fox-related aspects. Vulpine behavior in urban areas has been a subject of study.