Zip saw, pelic saw, seesaw... can't say I've hunted with anyone that use them. I know an old timer that used a stout knife blade to split the pelvis, but I have never needed to perform such an act. Field dress, remove associated internals... including the bladder, and get going. Heck, even my taxidermist, who can completely disect a deer with a pen knife in under 5 minutes, (and I do mean completely), doesn't tamper with the pelvis afield. No need.