The genus "Mustela" includes the least weasels, polecats, stoats, ferrets and mink. Other common small mammals include shrews, rabbits, hedgehogs, polecats, martens and badgers. The carnivores are polecats, brown bear, lynx, wolves, foxes, wolverines and the sable. They also prey on small carnivores, such as mongooses, polecats, and wildcats. Hybrids can swim well like minks and burrow for food like polecats. Where ferrets coexist with polecats, hybridization is common. Denmark is also home to smaller mammals, such as polecats, hares and hedgehogs. The beech marten has been known to kill European polecats on rare occasions. In 1945, Kabul shopkeepers were reported to have kept marbled polecats to exterminate rodents. Whether this was a reference to ferrets, polecats, or the similar Egyptian mongoose is uncertain. European polecats "Mustela putorius" were found to engage homosexually with non-sibling animals. The biting louse "Trichodectes jacobi" is also known to infest polecats. Marbled polecats mate from March to early June. Incidences of polecats carrying rabies are high in some localized areas. Another, less common species to infest polecats is "I. canisuga".