Tanzania Wildlife Photography Lens Advice - 600mm?

I received a great email this morning from a colleague who is headed out to Tanzania for the first time. He’s seeking advice about whether or not to bring along his 600mm f4 or his 200-400mm f4.
Here’s his question:
Hey Mike
I hope you are not too crazy busy to offer a wee bit of advice. [...]

New Slideshow: Birds of Northern Tanzania

Here’s a two minute slideshow of photographs taken in Northern Tanzania during two of our Photo Safaris. Images were taken with the Nikon D700 or Nikon D300. Lenses used were the Nikon 200-400mm f4 AF-S VR and the Nikon 70-200 f2.8 AF-S VR. Enjoy!

Birds of Northern Tanzania from Mike Hagen on Vimeo.