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 Koi Butterfly Koi are becoming more widely available as demand grows, seeing many variations in color and quality emerge. The Butterfly has very similar feeding requirements and habits to other Koi and so can be kept alongside them happily. Butterfly Koi Butterfly koi, longfin koi, or dragon carp are a type of ornamental fish notable for their elongated finnage. The fish are a breed of the common carp, "Cyprinus carpio", which includes numerous wild carp races as well as domesticated koi ("Nishikigoi"). Butterfly koi originated in the mid-20th century as a result of an effort to increase the hardiness of traditional