This encyclopaedia presents a comprehensive and academically rigorous examination of the zoological characteristics and behavioural patterns of animals, offering an integrated understanding of their biological nature, functional traits, and adaptive responses. It explores the scientific foundations of animal behaviour through genetic, evolutionary, physiological, and cognitive perspectives, explaining how internal mechanisms and external environments shape behavioural expression. The book analyses communication systems, social organisation, emotional capacity, learning, and instinctive responses across diverse animal groups. By combining behavioural science with evolutionary biology, it illustrates how natural selection, hormonal regulation, and sensory systems influence survival strategies, reproduction, and interaction within ecosystems. Detailed attention is given to behavioural diversity across species, highlighting both shared biological principles and species-specific adaptations.

The book further examines anatomical and physiological foundations underlying behaviour, linking structure with function in animals across terrestrial and aquatic environments. It also addresses comparative and model-based approaches used in modern zoological research. Designed as an authoritative reference, this work is intended for students, researchers, and professionals seeking an internationally relevant and academically grounded resource on animal characteristics, behaviour, and biological responses.