also i have noticed thread on support forums leading me to think that just taming an animal with stars doesnt stop them de spawning.. so catch a NO star animal ..tame it... then go hunt a 2 star and bring it back and tame it and breed from it without leaving area..as the 2 star may despawn.. but its bred offspring wont! (that ive noticed ) 50% of piggies will be 2 star so kill the one stars and you will have success