Grysboks are usually hunted as the opportunity arises while on a hunt for other other animals. However there are hunters who want to collect the 'tiny ten' antelopes and may devote whole hunts to this enterprise.
There are 2 subspecies of grysbok - the Cape or southern grysbok and the Sharpe's or northern grysbok.
The Sharpe's grysbok is slightly smaller than the Cape grysbok, though the Cape grysbok can fluff out the fur at its rear end to make itself look bigger. It has a short and almost invisible tail.
The primary physical difference between the two grysboks is that the Sharpe's has a pair of 'false hooves' above the fetlocks. However if you want to make sure of the type of grysbok you are hunting, clearly you would not try to check out the fetlocks but hunt in areas where each type is definitely prevalent.