Amen to what Mike said. $5,000 camera, $800 Carbon-fiber tripod, $600 Wimberley gimbal tripod head, $1000 waterproof cases for all, $300 batteries, $10,000 lens (and that's only one), $1000 teleconvertors, $400 Camo covers for all, $200 blind, $100 CF memory cards X 3 or more, $500 portable photo bank, $2000 Mac for post-processing, $80 firewire card reader, $700 Adobe CS3 for post processing, $1,800 30" Cinema Monitor, Misc. ($$$$$)
And yes 1000's of pics taken for practice, and hundreds to get these few shots. Oh, and lets not forget the cost of models and bait. Lots of these real close up shots of raptors, are taken in semi-controlled conditions and with the possible use of trained animals. To get shots like that, you have to know where the bird is to pounce on his prey. This type of serious glass is not a zoom - but a fixed focal length. If you want to get a full frame shot of a moving Osprey, you better know where he is going and be at the correct distance from him. No amount of money on the highest dollar equipment and fastest autofocus can overcome the movement inherent in panning a diving Osprey - especially with a 600mm f4 or longer (and slower) at that frame filling closeness. He probably had to pre-focus on an area and await the bird coming and then held the shutter release down and held on. Luck, knowledge, and great technique combine for great shots.