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
Butterfly style and Ryan Miller. The profly "style" is a specialized progression of the butterfly style. The name derives from a goaltending leg pad model designed specifically for the use of the butterfly. The term eventually evolved into a style for goaltenders who tend to use the butterfly save technique as a base for the majority of their save selections. The term "hybrid" is commonly used to measure how far a goaltender strays from using the butterfly technique as a base save. Some goaltending circles use the term "hybrid" as a middling term from a pure butterfly goaltender to a pure stand-up