Taking into account the 70mm lens focal length, the distance between the bird and the camera, and assumed bird flight path straight towards you, we can assume it was a male hawk. They are typically half a meter long with a wingspan of up to one meter. That corresponds to about 0.6mm dot on my screen. A female hawk is usually larger - up to 0.9mm on the screen of the same size. In a case that the hawk was flying across your field of view, then you were lucky to get yourself a nice profile shot of a fully grown female hawk which can grow to 65cm in length with a wingspan up to almost 1.5m.
