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 the 1960s and 70s by Roger Crozier and Tony Esposito. In spite of their success, the butterfly fell out of favour until the emergence of Patrick Roy in the mid-1980s. This new, modern butterfly style has been referred to as the "profly" style. As in many arts, there is no universal agreement on style classifications with modern goaltending techniques. Modern hybrid coaches such as the late Warren Strelow worked with goaltenders associated with the profly style such as Miikka Kiprusoff. The butterfly is not a style but a save selection used by most goaltenders. The butterfly style is contrasted with