The unique Mosquito Flight

Instantaneous streamlines show the airflow around a mosquito in flight…

…including a newly discovered mechanism that helps them to fly, the trailing-edge vortex.

From the study of mosquito flight in Nature:

Mosquitoes exhibit unusual wing kinematics; their long, slender wings flap at remarkably high frequencies for their size (>800 Hz) and with lower stroke amplitudes than any other insect group.
This shifts weight support away from the translation-dominated, aerodynamic mechanisms used by most insects, as well as by helicopters and aeroplanes, towards poorly understood rotational mechanisms that occur when pitching at the end of each half-stroke.

The unique Mosquito Flight