It is a blue jay flying away from the camera. Here is the same bird about 5 seconds earlier.
Take a close look at the patterns the bird presents while in flight.
I see a huge face with two clear eyes and a distinct predatorial look. Rather like a large owl looking backwards out of the blue jay.
Now look back at the first picture and try to see the bird without the owl face. It strikes me that in that particular moment this blue jay was safe from the hungry hawk contingent. Smart bird.