It doesn't have to be though, nuclear spider (butter-fire-spider) have that exact flame on the tail too. The belly pic was of the normal, and I do agree though that it does look het pied, so it's not impossible, but butter does flame out if combined with some other morphs. If there is another morph going on, I saw someone say black back or something like that, then it might flame out. Would be good to breed a male back to mom though, it would settle it.