Pac-Bears are enemies in the Forest area of Pac-Man World 2. As their name suggests they are a Pac version of Bears. During their infancy they are called Pac-Cubs. They are big creatures that mainly appear in the forest. Pacman can only defeat them when they face his direction and he has to rev roll him in the face.
"The Pac-Bear is one of the largest natural creatures in Pac-Land and has little to fear. Pac-Bears are large enough to eat any of the Pac-People, but prefer to play with their food before eating it. Pac-Bears can be found in various climates."