User blog comment:Mectrixctic/Re-writing Puffle article somewhat/@comment-1024726-20091017202340

As in microevolution? Obviously that has to be allowed, how else would animals adapt?

Ununoctium may have such a short half-life that it won't be observed in full, but it WILL be inert like the rest of the noble gases. That's how universal classes work.

As for having them be in a different class, at least make them closely related to mammals -- they share many common characteristics with them.

And we can't take the original designs into consideration -- they're not canon.