Having been over a few times, Vaal Rhebuck can be a tough one to get. Most say it's the most difficult in the Southern African countries. Between habitat, spooky attitude and rarity they are hard to get.
If you want for all of Africa my PH in the Congo claims a yellow backed duiker may be the most difficult. Along with forest Sitatunga and bongo they make for a tough hunt.
Bruce

Last edited by Gillettehunter; 03/28/24. Reason: bad spelling