Where ferrets coexist with polecats, hybridization is common.
British Dictionary definitions for polecats
noun (pl) -cats, -cat
Also called (formerly) foumart. a dark brown musteline mammal, Mustela putorius, of woodlands of Europe, Asia, and N Africa, that is closely related to but larger than the weasel and gives off an unpleasant smell See also sweet marten
any of various related animals, such as the marbled polecat,Vormela peregusna
1320, first element is probably Anglo-Fr. pol, from O.Fr. poule "fowl, hen," so called because it preys on poultry. The other alternative is that the first element is from O.Fr. pulent "stinking," for obvious reasons. Originally the European Putorius foetidus; also applied to related U.S. skunks since 1688.