Against my better judgment I will chime in here.

I know Will Bird pretty well and I really like the guy, he does have some very nice looking jungles, however on the issue of purity I can say this.

Will has always told me that his jungles were pure as far as he knew but that they lacked the kind of background to be absolutely certain. In fact I imported a female pure jungle from Europe for him that he wanted specifically so that he could breed his zebra to a known pure jungle.

This in no way invalidates Wills jungles, they may well be the real things, they do look like pure jungles and as far as anyone can tell they are, but this falls short of certainty.

Nick