See a superb video of a goshawk in flight at this link. This has powerful implications beyond our fascination with flight. You may have seen many images of hawk silhouettes pasted on windows with the intent of dissuading birds from colliding with the glass. There is a lot of evidence that the space between such decals or silhouettes needs to be only about the width of a human hand. This video adds to that understanding; even a bird this size can fly through a small space.