User blog comment:Mectrixctic/Re-writing Puffle article somewhat/@comment-1024726-20091016195946

However, I continue to disagree with your notion of having puffles not being mammals just because they are telekinetic. Mammals are NOT defined by telekinetic ability. If a creature with hair, warm-bloodedness, sweat glands, three middle ear bones used for hearing, and telekinesis were discovered, scientists wouldn't just classify it as non-mammalian just because of the telekinesis (unless there were more significant differences besides the telekinesis that would prove to be more than enough to make the creature non-mammalian). Same for the fur, mammals don't HAVE to have fur in shades of red, orange, or yellow, that's not a DEFINING characteristic.

And as TS said, the old designs aren't canon. Just proto-canon.