This frame shows a juvenile Peregrine falcon in a high-speed dive. These raptors are the undisputed kings of the sky attacking birds much larger than themselves, even a pelican! They have amazing control at high speed, never get bored of watching or photographing them.
I made this shot with the 1D-X Mark II and 600 IS II hand held. ISO 800. F/4 at 1/3200sec. Processed with DPP 4.4
I had shot at the same location 2 years ago with the original 1DX and I can say that the 1DX MKII is a significant upgrade in AF when it comes to these challenging conditions. I was impressed by the results.