vulpo

Every language that tells stories gives the fox the same part, and Esperanto inherited the casting along with the word. Ezopo - Aesop - is the source most of Europe reads it from, and his fox is the one who cannot reach the grapes and decides they were sour anyway, an image that survives in Esperanto as acidaj vinberoj. A clever person is ruza kiel vulpo, and the adjective vulpa carries the same faint accusation as English "foxy".

The female is vulpino and the cub is vulpido, both by the ordinary suffixes; the den is vulpejo. This chapter's story puts one in a campsite, raiding the butter while the campers sleep, which is roughly what a real fox does with a real tent.