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
The Lion has Many Ears of jealousy; that Guðrún's son Svenni stole the antique pistol; that Kjartan in fact killed himself, staging his suicide as a murder (echoing how in "Laxdæla saga" Kjartan refuses to defend himself against Bolli); and that Hrefna murdered Bolli, apparently supposing that he was to blame for Kjartan's murder. In an epilogue, Guðrún bumps into Leó in the street and it becomes clear from family resemblance that her son Þorlákur is in fact not Bolli's son, but Leó's, and the two become a happy couple, echoing Guðrún Ósvifursdóttir's fourth marriage, to Þorkell Eyjólfsson, in "Laxdæla saga". The Lion has Many