Now, I'm just going by something I heard, I think it was on here, but I can't back it up. Bps in the wild aren't all that genetically diverse to begin with. Since they don't tend to travel long distances, I think it could be said that the specimens in a given area are going to be related anyway. So it would seem that they may have a naturally occurring tolerance to inbreeding that would be lacking in more "traveled" animals. Not that I'm looking to inbreed the hack out of mine or anything, it just seems a logical explanation for why we can get away with so much of it when it very quickly has bad effects in other animals.