We have been trying to classify living organisms throughout history. Through this enthralling narrative, students learn about the early methods used to classify living things, including those of Aristotle, Andrea Cesalpino, Gasphard and Johann Bauhin, John Ray, Carl Linnaeus, and Charles Darwin. Evolutionary relationships, studied in the field of phylogenetics, are also investigated. Readers learn about phylogenetic trees, dichotomous keys, convergence, divergence, parallelism, and about cladistic analysis. Students discover that the science of classification is ever-changing, and find out about the addition of kingdoms. Archaea, bacteria, and eukaryotes are also covered.