User blog comment:Jens Ingels/Breeding Legend Dragons (the compair array list)/@comment-8962068-20130523063548/@comment-3271569-20130523103713

Like I said this is based on the old breeding system. Now the opposite error will apear but will continue with the process unlike the previous version of the system.

Poo is also in stage 3 and that process has another unlock requirement.