There are really no limits. Any type of wildlife from deer and antelope to bison, long horn steer and bear. Elk, coyote, game cats such as leopard and caracal are all doable. Even unusual species like alligator, baboon or even ostrich skulls make extremely interesting and beautiful beaded skull art center pieces. As long as they are taken or purchased legally, any wildlife skull can be commissioned as a beaded skull art piece.