This is very good information to keep in mind for the future. While I don't keep the specific breeds mentioned, I've no doubt that this is a condition that could crop up in any breed, with the right genetics involved. Looking at the photos actually immediately reminded me of my Seramas - I'd noticed how apple-shaped their heads are compared to my other birds previously, and know that some lines are prone to extremely short legs. However, the other markers don't match, much to my relief.