This book presents a comprehensive review of various biological and ecological studies in animal science, including their embryology, evolution, classification, habitats and distribution. Topics discussed herein include rodent models of central nervous system tumours; case studies in which butterflies appear in artworks produced by individuals at the very end of life; comparison between biological control with fungi (duddingtonia flagrans and monacrosporium thaumasium) and chemical control (moxidectin) of gastrointestinal nematodiasis in beef cattle; micro-spaces of avian foraging and human presence; a comparative analysis of human perceptions of cougars and other large carnivores in Canada and El Salvador; pattern formation and diversity in butterfly wings; d-amino-acid oxidase in rodents; the racoon dog (nyctereutes procyonoides) in the community of medium-sized carnivores in Europe; diversity of parasitic nematodes of marine fishes from the gulf of Thailand; and the role of snails in renal epithelial to mesenchymal transition.