In the book "A new subspecies of lizard, Cnemidophorus sacki, from Michoacán, Mexico", the famous herpetologist William Edward Duellman presents a description of a new subspecies of lizard that was discovered in the state of Michoacán in western Mexico. The book contains a detailed analysis of the morphological features of this lizard, its behavior, habitat and genetic characteristics. The author reveals the history of the discovery of a new form, giving readers the opportunity to delve into the world of science and biodiversity research. "A new subspecies of lizard, Cnemidophorus sacki, from Michoacán, Mexico" is a must-read for all natural science and herpetology enthusiasts.