For birders, and creepy stalkers, this is The Ultimate Lens! However, I don't see it in my possession anytime on this side of the grave. Gear like this would also create problems in finding suitable tripods and heads, and you would also need to hire a substantial amount of sherpas to haul it around to the birding locations.
It comes with a golf caddy...it fits in the bag quite nicely. The price includes one year of salary for him.