The red duiker is relatively small and slender; females tend to be larger and heavier than males. Both sexes are a uniform tawny red, with individuals from the northern part of the species' range being brighter and more rufous. The underparts are typically only slightly paler than the rest of the body.
Some interesting facts about red duikers!
Red Duikers do a great deal of scent marking, using a substance secreted from the maxillary glands near their eyes. A Duiker will rub its face on grass, twigs, bark or other surfaces to mark its territorial boundaries, or even on its mate or calf to 'label' the other animal.