  Here we report the first sub-milligram flapping wing vehicle which is able to
mimic insect wing kinematics. Wing stroke amplitude of 90$^\circ$ and wing
pitch amplitude of 80$^\circ$ is demonstrated. This is also the smallest
wing-span (single wing length of 3.5mm) device reported yet and is at the same
mass-scale as a fruit fly. Assembly has been made simple and requires gluing
together 5 components in contrast to higher part count and intensive assembly
of other milligram-scale microrobots. This increases the fabrication speed and
success-rate of the fully fabricated device. Low operational voltages (70mV)
makes testing further easy and will enable eventual deployment of autonomous
sub-milligram aerial vehicles.
