 A bear who was nicknamed "Teddy" played the role of the killer  grizzly bear. "Teddy" stood 11 feet tall and at that time was the  largest grizzly bear in captivity and was trained, but untamed by  the bears trainer. The crew was protected from Teddy by an  electrical thin green wire that ran throughout the forest locations.  In addition, a mechanical bear was used for when the bear had  attacked.