Man it's cool.

Could we make fully functional mechanical beasts?  I mean think about it.  We just need to design a way for it to search for a power source to get energy.  A way to syphon said electricity.  The procreation thing is the hard part.

Air Ray PDF

Air_ray is a remote-controlled hybrid construction comprising
a helium-filled ballonett and a flapping-wing drive mechanism. The
ballonett is a gastight bladder of aluminium-vaporised “PET foil”
with a specific mass of 22 g/qm; it can be filled with up to 1.6 cbm
of helium. Since 1 cbm of helium generates approx.1 kg weight of
buoyant force, Air_ray’s overall mass must not exceed 1.6 kg.

Air has a density of 0.0012 kg/m3 at 20° Celsius at sea level;
by comparison, the density of water is about 1 kg/dcm3. In the
design of Air_ray, the difference in density between these two
media necessitates an extremely light construction. This enables
Air_ray to almost hover in the air by means of the buoyant force
of the helium ballonet, floating through a sea of air just as the
Manta_ray does in water.

The propulsion is effected by a flapping-wing mechanism. The
wing module, which can be moved up and down by a servo drive
unit, has a structure like that of the tail fins of many fish. This
structure consists of two alternating pressure and tension flanks
flexibly connected by ribs.

Cool

I'm not sure why they made it...except it's cool.