Earth Life
Earth Life Web: Anatomy of Birds
Beginning with the bird skeleton, this website from Earth-Life Web describes bird anatomy and morphology. Pictures and diagrams are included for each section. Feet, wings, eggs, and feathers are just some of the topics discussed.
Smithsonian Institution
Smithsonian National Zoo: Bird Bill Matching Game
Can you identify the purpose of different bird beaks? Read up about the different types of beaks and then you'll apply your knowledge by identifying the purpose of different shaped beaks.
San Diego Zoo Global
San Diego Zoo: Birds
This resource provides detailed information about birds, as well as several pictures.
Merriam-Webster
Merriam Webster: Dictionary Illustration: Bird Beaks and Bills
Labeled illustrations demonstrating the diversity of bird mouth parts, each adapted for particular purposes.