How the Snake Lost Its Legs fly embryo. His books on evolutionary developmental biology (evo-devo) include "Imaginal Discs: The Genetic and Cellular Logic of Pattern Formation" (2002), "Quirks of Human Anatomy: An Evo-Devo Look at the Human Body" (2009), and "Deep Homology? Uncanny Similarities of Humans and Flies Uncovered by Evo-Devo" (2017). In Held's view, "Quirks", "Snake", and "Deep Homology" form a trilogy on evo-devo. "How the Snake Lost Its Legs" is ostensibly organised into six chapters, but in effect into three parts. The first chapter serves as an introduction and overview. The next four chapters provide what Held calls "the meatier aspects of evo-devo" with
Madama Butterfly carries her sleeping child into the other room and tells him to sleep, while she too falls asleep. Suzuki waits in the front room and hears a knock at the door. Pinkerton and Sharpless have arrived, but Pinkerton tells Suzuki not to wake Butterfly and asks how Butterfly knew that he had arrived. Suzuki tells him that, for the last three years, Butterfly has studied every ship that entered the port. Sharpless tells Pinkerton, "Did I not tell you so?" Suzuki sees a strange woman in the garden, learns from Sharpless that she is Pinkerton's American wife and collapses to