Angry visitors gathered in front of the polar bear enclosure and shouted "Rabenmutter" (literally, "raven mother", meaning "evil mother") every time Vilma appeared.
Pengunjung yang marah berkumpul di depan kandang beruang kutub dan berteriak "Rabenmutter" (secara harfiah berarti "ibu jahat") setiap kali Vilma muncul.