I feel like I've seen a challenge like this before or titled the rogue male challenge.. Start with 1 male creature with derp snout, deformed paws, and other than that randomize it. As soon as you find a female wanderer, invite them. Mate with them, and when they have a male babey kick 'em out. Kick out any female babey. Continue the cycle with the babey being the new rogue, and if the father didn't die yet kick 'em out.