A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México

"A New Subspecies of Lizard, Cnemidophorus sacki, from Michoacán, México" by William Edward Duellman is a scientific report from the 1960s that introduces a newly discovered lizard subspecies, Cnemidophorus sacki zweifeli, located in Michoacán, Mexico. The publication informs the subject of herpetology and describes the lizard's unique qualities and how it differs from other lizards, in size, appearance, and structure. It talks about what environment it lives in, how its size and color change, and the differences between males and females, also covering the lizard's actions during different times of the year and where it is found in the Tepalcatepec Valley. This research shows how important naming and studying animals in their real environments is to truly understand different kinds of life on Earth.