Board Thread:Naruto Discussions/@comment-24837927-20140421121126/@comment-3279282-20140428100935

The manga says the Biju are made of flesh, though. I'm no pro in that field, but doesn't flesh need blood to live? Or maybe in case of the Biju, it needs chakra because it's actually called chakra flesh? Dunno, but it's a fact that it's flesh, maybe made out of chakra, maybe not, who knows.