- Century of Flight: Ornithopters
 - Describes the origin and evolution of ornithopters, helicopters, and kites through the ages. - How Ornithopters Fly
- Comprehensive study of ornithopters, their flight principles, and the development of ornithopters in theory and practice. Site also features various models, video clips of ornithopters in flight, and bibliography.
- Human Powered Ornithopter
- Presents the history, design theory, and construction details of the aircraft Karura. In English and Japanese.
- Ornithopter Zone
- Resources for ornithopter enthusiasts which offers a teacher's guide and building kits, video clips, discussion forum, online stores for flapping-wing bird models, and related links.
- Ornithopters Are the Next Big Challenge
(PDF) - Research article about ornithopters, the planes which mimic the flapping motion of birds. From the University of Arizona, Tucson, Arizona. In PDF format.
- Project Ornithopter
- Home page of the ornithopter research, design, and testing conducted at the University of Toronto Institute for Aerospace Studies, Toronto, Canada. In English and Italian.
- Wikipedia: Ornithopter
- Description and aerodynamics of an ornithopter, the aircraft which flies by wing-flapping.
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