Here's an image that I created on Oct 3, 2016 along Highway 60 about 6 kilometers west of Barry's Bay, Ontario. As we drove down the road we noticed birds (mostly gulls and crows) seemed to be flying everywhere. Suddenly two birds spiraled down to the ground locked in a struggle. They broke apart and one, a juvenile herring gull took off and the other, a raptor, took off after it. The raptor quickly caught the gull in the air and they crashed again to the ground this time at the edge of the other side of the road at the landfill entrance. The raptor turned out to be a young Peregrine Falcon.
If you look closely you will note that the gull has the falcon's foot in its bill while the Peregrine tries to subdue it. This shot was taken early during the struggle. They fought for about 8 minutes before the gull appeared to finally give up. Shortly after that however the Peregrine broke off the attack. It didn't look like the gull would survive.
An incredible thing to witness first hand!