They have been there before and obviously didnt like it much.
They got all the way to Vienna. Vlad the impaler helped to turn them back.
Go Dracula!
Perhaps he helped; but the historical savior of Poland, and indirectly, Europe, where the animals were headed, was King John Sobieski, who defeated the koraninals so decisively that it kept them away from another attempt at conquering Europe for the next 320 years...