Leonardo Da Vinci's Ornithopter

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A wing-flapping aircraft known as an ornithopter derives its name from Greek words meaning "bird" and "wing". Inspired by avian, bat and insect flight patterns, these machines are typically built to scale with their natural counterparts. Man-operated versions have been developed with some achieving success. Ornithopters can be categorized into two main types: those powered by engines and others driven by the pilot's muscles.