Ferrets are an albino domesticated form of Polecat. The fur is usually white or yellowish, but polecat - coloured ferrets can also be found. They are widely found across Europe.
Ferrets are part of the Mustelidae family, which also includes otters and skunks. They have a very flexible backbone and are renowned for their agility- they can literally be bent in half, making them very useful to farmers, who send them down rabbit burrows.
DID YOU KNOW? Ferrets actually have scent glands similar to skunks and will release the contents (not spray) if threatened; it is much milder than a skunk though.