Our local bird sanctuary had a visit from a mink/ferret one year and it destroyed all the wild ducks and gulls who couldn't fly which was most of them!
I once had to prise the jaws of a polecat/ferret off a kittens head after the polecat had escaped from its cage. Miraculously the kitten survived and lived to a ripe old age mainly because the polecats teeth were embedded in its skull and jawbone. If it was soft tissue it would not have been so lucky.
I can't stand the vicious little ***tards !