Sources & illustrations

These primary references support the background explanations. Read the source for details, updates and exceptions.

Background reading

• Cornell Lab: All About Birds identification guide
• Cornell Lab: bird feeder cleaning
• RSPB: bird identification guide
• RSPB: current garden bird health guidance
• RSPB: current feeding advice
• Cornell Lab: American Robin
• RSPB: Robin
• RSPB: Blackbird
• American Birding Association: Code of Birding Ethics
• RSPB: bird-bath guidance
• Cornell Lab: preventing bird-window collisions
• BTO: identification resources
• RSPB: Starling
• Cornell Lab: finding a baby bird
• RSPB: injured birds and local help

Original illustrations and examples

The subject illustration and guide diagrams are original vector drawings. Worked examples and practice exercises are original teaching material. They do not represent an experiment or a personal product test. We do not reproduce reference-site articles, photographs, dictionary definitions, music scores or puzzle answers.

Scope

US and UK backyard bird observation, comparison and welfare. This is a small educational shortlist, not a complete field guide, veterinary service, photographic course or travel journal.

References checked on 18 October 2026. Product interfaces, regional advice and datasets can change after publication.