Leonardo da Vinci studied an ornithopter as a possible imitation of bird flight.
An ornithopter is a machine designed to fly by flapping wings rather than by using fixed wings or a continuously spinning rotor. Leonardo’s notebooks contain studies of bird anatomy, wing movement, air resistance, and mechanisms that could transfer human motion to wings.
His proposed machines were inspired by birds and bats, but they could not realistically be powered by a person’s muscles alone. Human muscles do not provide enough sustained power for a large flapping aircraft, and the materials available to Leonardo were not light or strong enough for practical flight.
Leonardo’s work still mattered because he treated flight as a mechanical and biological problem. His observations helped connect the design of flying machines with anatomy, balance, and the behavior of air.