This comprehensive volume presents the biology of the leaf‑beetle family (Chrysomelidae). Drawing on decades of research, the author details the anatomy, life cycles, ecology, and evolutionary relationships of these insects, complemented by numerous figures and plates that illustrate key morphological features. The text serves both as a reference for professional entomologists and as an accessible introduction for students of zoology, covering topics such as host‑plant interactions, defensive chemistry, and the role of chrysomelids in ecosystems. With a clear, systematic approach, the work integrates field observations with laboratory studies, offering insight into the diversity and significance of this globally distributed beetle group.