Rubbish, We wiped out there natural predators, and still cull animals that kill other animals naturally that we cull... we need to stop intervening. Its a mess. Predators if left to there own devises will raise in numbers to match there food, and this is only more true with the introduction of wolfs into Scotland that WE wiped out years ago. You think that if there was no humans that there would be millions of deer? or do you think some God will intervene? Nature can control populations, and has done a long long time before we walked the earth. And i agree with you with some of the man made breeds, that they will die in the first few years if not sooner but the animals as a specie not individual breeds will live on without us, but balance would be restored, its inevitable. Its will happen if you like it or not, before or after humans kill them self's.