This little critter is meant for distant shots where you need shilouettes of crows flying around.
I've used a simple flat black material on this model, as well as a simple rig.
Going into POSE MODE on the armature, the RED bones are the main control bones for the wings and tail.
The left wing (as the crow flies, so to say.. ;) is set to mirror the motion of the right wing using a COPY LOCATION bone constraint. In a similar fashion, the spread and angle of the tail bones is setup so
that you only need to position the red right bone to pose the entire tail.
This is setup to mimic the natural flight characteristics of crows, to a certain extent.