Abstract: An ornithopter having a pair of flexible fabric wings which are flapped in unison by an elastic motor-operated crank assembly to support the ornithopter during flight. A flexible generally U-shaped member is mounted on the front end of a longitudinal rigid base. A pair of rigid wing struts are pivotally mounted on the tips of the U-shaped member and extend outwardly transversely with respect to the longitudinal base. The crank assembly has a reciprocating lever which is pivotally connected to the inner ends of the wing struts between the spaced tips of the U-shaped member. Rotation of the crank by the elastic motor reciprocates the lever up and down pivoting the wing struts on the tips of the U-shaped member which simultaneously flex inwardly and outwardly, enabling the wings to flap in unison. A flexible spline extends upwardly forwardly from the rear end of the base. A flexible fabric is attached to the wing struts and spline and extends toward the rear of the base to form the pair of wings.