You know, it always squicks me out when people turn into bugs in fiction. Not because they're bugs, but because of the possibility of them getting squished. I'll be honest, I'll stomp a bug when I see it unless I think it's pretty. I think most other people do too. So what happens when a shapeshifter is scurrying along as a bug and someone sees them? What a horrible way to go...*shudder*
Incidentally, that always bugged me about the Harry Potter books. Rita Skeeter turns into a beetle...