This guide investigates the identification and classification of common bird species found within the British Isles and surrounding regions. The authors, Martin W. Woodcock and Richard Perry, utilize their expertise in ornithology to compile a portable reference tool for amateur birdwatchers. The book presents a structured framework for species recognition, emphasizing physical characteristics, habitat preferences, and behavioral traits to assist the reader in field observations.

The Collins Gem series is widely recognized for its utility as a compact, accessible reference for field naturalists. The content provides a concise and practical approach to ornithological identification suitable for beginners and casual observers.