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What Is a Bird? - An Exploration of Anatomy, Physiology, Behavior and Ecology
This excellent RSPB guide to bird anatomy looks at the avian body, system by system, how it evolved, and how it functions.
This excellent RSPB guide to insect anatomy aims to demystify the way that insects live, from the fine detail of their internal processes to the way they co-exist with all other forms of life.