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 Conservation Butterfly Conservation Butterfly Conservation is an insect conservation organisation in the United Kingdom. It is one of the largest insect conservation organisations in the world. The organisation was originally formed in 1968 as the "British Butterfly Conservation Society," by a small group of naturalists, headed by Sir Peter Scott. It was registered as a charity on 7 March 1968. The aim of the new society is to stop the alarming decline of many butterfly and moth species in Britain, and at the same time help safeguard the environment itself. Butterfly Conservation has become the largest insect conservation organisation in Europe