Real birds are capable of impressive acrobatic flying maneuvers because they can precisely control their wing motions.
It is very difficult to replicate that with a robot because bird-like maneuvers require an extremely lightweight platform. The robot raven in this video, however, is built out of intricate 3D-printed parts that are made of extremely lightweight materials. This allows its developers at the Maryland Robotics Center to program its wings to do almost anything a real bird can do, from dives to back flips.
Their creation is already fooling real birds.
Check out Dr. S.K. Gupta's blog for the full story: