"Because there are so many kinds of animal a daemon could be," says Isibel. "If one is very common, of course the people who have it will be different from each other - any large group of people are different from each other. If one is less common, there is no way to know whether commonalities between those people are related to their daemon or sheer coincidence. They have drawn some conclusions anyway - but then daemons normally choose forms around puberty. Acquiring them as an adult might be different in some way; we do not know."