No secret, Canon 7D with a 100-400mm f/4.5-5.6 L IS USM lens. This is a great combo. The camera shoots 8 fps and the lens is amazing! The hardest part is being in the right place at the right time. This is a good sequence, but one pic a branch is in the way, and the last one the bird is not in the frame as much as I would have liked. And lighting is always tough, especially in the woods.
Takes a lot of practice!
Thank you
Chris