A herd of Grant's gazelle (Nanger granti) is a common sight on the Serengeti. The gazelle's lyre-shaped horns not only bequeath a graceful appearance, but give it formidable tools for defense. Unlike antlers (that are shed annually), gazelle horns are permanently affixed, corrugated, and unbranched.
This species is named after James Grant, a preacher's son who worked with John Speke in the quest to discover the source of the Nile. I'm enjoying Tim Jeal's account of this pioneering work right now in his Explorers of the Nile: The Triumph and Tragedy of a Great Victorian Adventure. Its a good read for folks with a strong stomach (!) who are interested in the story of East Africa.