An earlier post joked about "cockroaches of the book". Then I was thinking not about scurrying little pests but about printed waste. But I don't want to overlook the relevance of critters to early modern books, so: what do you see in the image above? Tiny little black circles? Did you guess? They are worm holes, the traces of where little bookworms ate their way through this book (you might recognize it as the 1527 Bible I've discussed before).
Read more about wormholes in ABC for Book Collectors: