Yellow-backed duiker
These forest dwelling antelope feed selectively on plants or plant parts such as shoots, roots, leaves, and buds, but their diet is mainly made up of fruits. The yellow-backed duiker is more efficient at digesting poor quality food than most other duiker species. This allows them to eat large, low quality fruits. Their diet makes them very hard to keep in captivity as most domesticated fruits are not well suited to their low fiber requirements. They are considered concentrate selectors, meaning they eat "diets relatively low in fiber, have a well developed ability to forage selectively, a rumen bypass, a rapid passage and high fermentation rate for starch, and they frequently encounter toxins."
Royal antelope
The royal antelope is the smallest antelope in the world; it is the smallest ungulate and ruminant as well. Bates's pygmy antelope is only slightly larger. The royal antelope reaches merely at the shoulder and weighs . The head-and-body length is typically . A characteristic feature is the long and slender legs, with the hindlegs twice as long as the forelegs – a remarkable similarity to the hare. The thin tail, long, is white on the underside, ending in a white tuft. The species is sexually dimorphic, with females being larger than males. Only males possess horns, these being short, smooth, ventrally reflexed spikes measuring long.