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You may want to consider renting the lens in the country that you'll be traveling in. Another suggestion, there are a number of photographers that lead photo tours in Africa, it would be fruitful to visit their websites and see what they recommend. From one I looked at, the recommendation was 2 camera bodies (a spare if one is damaged), and a 300 and 600mm lenses, with a quick aperture, say F2.8. The fast lens is recommended given that you'll be shooting in the early morning and at dusk when the animals are active. If you are taking a tour or working through a lodge, see what they recommend and also whether they might rent or otherwise provide the equipment. A friend spent 2 weeks in SA and Botswana and only needed to bring a bunch of memory cards. Also, don't forget a computer and two spare SSDs to backup your photos.