Is That a Bookworm?

Connor recently found this living in his Language Lessons workbook:

Yep, Connor opened the book up and this little guy was basically living inside it.  Now, I’m fairly certain that we read last year in his Nature Reader that bookworms don’t actually eat books. However, I’m not so sure that was accurate, as this guy was working his way through the current page, as evidenced in the following photo: 

                                         

And, yes, I do think that’s worm poop