I heard the clashing of horns near my camp, took my Nikon and slowly stalked the noise. There was an intruder nyala bull and he had just been pushed off by the bull which was evidently the daddy of the family. This daddy heard my stealthy approach and came to investigate - visibly immensly agitated. That is nyala - any other antelope snort of bark to warn te family and run off. I took the photo and retreated slowly, watching him all the time. Nyala bulls in defense of the family are very dangerous. More humans are killed by unharmed nyala bulls than any other antelope. Look at those arrow-sharp horns. Another time we came round a bend in the narrow bush track and saw these two in a clearing, facing off in their way of posturing - like nyala also do most of the time.