the cow made it through the war so why not pigs? they are much tougher critters than the brahmin cow and will revert to a feral state readily. My thoughts on the matter are why not 6 leggged mutated pigs(that way you get 4 hams from a pig not 2...yum!)? Feral ones could be a real fight to kill too....and think of all the things you could craft from it... ham (yum) sausage, chops, lard for torillas, the pigpen could provide salt peter etc...anyone care to mod this? I think it might be fun. Also, Pecarinos are all over the Mojave desert so its already part of the ecology.