http://www.theverge.com/2016/7/14/12187562/drone-bird-crash-landing-somalia-military

What’s most interesting about this particular drone are its wings:
in addition to looking like a bird, the wings will flap, although it looks like
it’s actually powered by two sets of propellers. A quick glance at it flying
overhead likely won’t attract a lot of attention, which is exactly what you’d
want for a surveillance robot.