RE: Pelvic Bone???
Most of the time I usually don't split the bone. I usually leave that stuff in until I get back to camp where I have access to running water. Cut around the anus from inside the cavity and outside under the tail. You can guide the knife with your fingers. Once you cut the connective tissue, you can pull the bladder and canal right out. Knock on wood, I have yet to puncture the bladder using this method.