Polecats are solitary and predominantly nocturnal weasel-like animals, where the males are quite obviously larger and heavier than the females. They produce a strong musky scent from anal glands when threatened, and this is also used to mark their territories. These streamlined predators can lock their jaws together so tightly it can be near impossible to pry them apart. Ferrets are the domesticated descendants of the polecat.
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