When Jenni Lecky-Thompson, Head of Library Services at Cambridge (UK) University’s Trinity Hall, was looking for an interesting animal book to write a blog post about she discovered a pressed butterfly, beautifully preserved in the folds of England’s earliest insect book, Insectorum Sive Minimorum Animalium Theatrum (Theatre of Insects). The butterfly, as colorful as the day it was pressed between the book’s pages, could be almost as old as the tome itself, which was published in 1634.