Four volume set - Entries focus on non-humans from the animal kingdom, from insects to reptiles to mammals - Early humans are addressed in an evolutionary context, and modern humans are included only for interspecies comparison or for their efforts to coexist with other species - The encyclopaedias also contain species overviews which discuss notable anatomy and physiology, habitat, behaviour and reproduction and include a sidebar listing classification, geographical location, life span, and special anatomy.

Author: Hoagstrom, Carl W., editor

Coverage: v. 1. Aardvarks-endoskeletons -- v. 2. Estivation-learning -- v. 3. Lemurs-respiration in birds -- v. 4. Respiratory system-zoos