long lens, fast shutter speed is what you need,
i remember in college people in photo class would practice focusing on cars going down a road and on other things that move like runners at track meet and such
i'm not sure how fast modern consumer cameras lenses can focus, but you probably want to have a 300 to 400mm lend at least to get a professional quality photo depending on how far you are from subject.
I saw a peregrine falcon hit a pigeon, only because I had spotted the falcon on a perch and waited to see what it would do. Rather than just watch the show, I fiddled with a camera that was absolutely not up to the task. The photo contained a small piece of feather, but not from the falcon. It was one of the many feathers that went flying from the pigeon on impact.
We can safely assume that the pigeon didn't make it. :-)
With my 180mm macro lens, manual focus is the only way to get these shots. The lens is not build for fast focusing. So you it requires very good distance estimation. Still only 1 out of 10 shots are good.