|A male Kirk's dik-dik at Etosha National Park, Namibia|
|Female mate of the male dik-dik in the above picture|
Dik-diks stand about 30–40 cm (12–16 in) at the shoulder, are 50–70 cm (20–28 in) long, weigh 3–6 kg (7–16 lb) and can live for up to 10 years.
Dik-diks are named after the alarm calls of the females. In addition to the females' alarm call, both males and females make a shrill, whistling sound. These calls may alert other animals to predators. The dik-dik is a favourite prey of the cheetah.
There are four species:
- Günther's dik-dik Madoqua guentheri
- Kirk's dik-dik Madoqua kirkii
- Silver dik-dik Madoqua piacentinii
- Salt's dik-dik Madoqua saltiana