Want to view and shoot like a hawk? Frankly, the furthest telephoto zoom lenses are but 600mm and they weight/cost a ton! And if shooting wildlife is your primary concern, why not think out of the box and shoot with a Nikon Field scope instead?
Its like shooting as a sniper, reinvigorating the boyish days we dream to join the Military Sniper School.
How's shooting at 1500mm focal length sound to you? Nikon ED82A is what you need! The Nikon ED III is not a bad choice either.