I don't know whether it's only me who notices this, but it's like DE ripped some wings off a pidgeon and glued them to the frame, they slowly flap if you stand still, other than that, they are basically dead. They could atleast animate when you move, fold a bit when you crouch, just something, not just sit on your back stiffer than a statue.
EDIT: When I say stiff, I mean they are constantly just streched out or invisible.