About Madoqua kirkii (Günther, 1880)
Kirk's dik-dik, with the scientific name Madoqua kirkii, is one of the world's smallest antelope species. Even the largest Kirk's dik-dik individuals stand 14 to 18 inches tall and weigh no more than 7.2 kg (16 lb). Females are typically 1 to 2 pounds heavier than males. This species has a slender, delicate build, with a pointed and mobile snout, large eyes and ears, prominent preorbital glands, thin pipestem legs, hare-like hind limbs that are noticeably larger than their forelimbs, and a vestigial tail. Coat color varies with habitat, ranging from grey to gray-brown, with tan flanks and limbs, an erectile head crest, and whitish markings on eye rings, ear lining, underparts, and rump. Only males have horns, which measure around 3 inches (8 cm) long, have a corrugated texture, and slant backward. Kirk's dik-dik male horns may be straight or curved backward from the facial profile; the basal half of the horns has seven to nine annular ridges, which are often covered by the animal's head crest. Kirk's dik-dik is sexually dimorphic: females are larger and lack horns, while males have a more developed muzzle, a longer crest, and tend to be lighter in overall color. Though physically very similar to Günther's dik-dik, Kirk's dik-dik can be distinguished by its longer nasals and premaxillae and shorter proboscis, which gives its head a more wedge-shaped profile than that of Günther's dik-dik. Kirk's dik-dik is endemic to savanna areas of eastern and southwestern Africa. It occurs primarily in the Somali and Southwest arid biotic zones, and may encroach into the Southern savanna biotic zone. Its distribution is discontinuous, with populations forming dispersed patches due to the species' specific habitat requirements. In Namibia, Kirk's dik-dik lives only in isolated areas along the Fish River, and does not reside within the Namib desert, though it may travel through desert thickets alongside water sources. This species prefers habitats with good cover but no tall vegetation. Ideal habitats provide a variety of browse, extensive shade, and an open understory at the animals' eye level (Tinley, 1969). Because of this preference, Kirk's dik-dik moves to new ranges when grass grows too high and blocks their line of sight. Typical habitats for the species are thicket mosaics with well-developed shrub layers and very little short grass cover. Kirk's dik-dik lives in pairs on territories that range from 2 to 86 acres in size, depending on available cover and resources. If no negative events disrupt the pair, they may stay in the same territory for their entire lives. Males are the primary defenders of territories, as females are not able to maintain territories on their own (Kingdon 1982). According to MacDonald (1985), territorial conflicts over high-quality habitat are not frequent. When conflicts do occur, males charge one another, stopping just before they would make physical contact, then repeat the charging process running from a longer distance. The encounter ends when one male surrenders; after this outcome, both males scratch at the ground, urinate, and defecate. Like other dwarf antelopes, Kirk's dik-dik lives as monogamous pairs within shared territories. Pairs mark their territories with dung and urine, deposited in a shared ritual that also helps maintain their pair bond. During the marking ritual, the female excretes first, then the male samples her urine stream to check if she is reproductively receptive. He paws at the ground, then places his own dung and urine over the female's deposit. Finally, both members of the pair mark nearby twigs with secretions from their preorbital glands. When courting, the male runs up behind the female with his head and neck stretched and his muzzle pointed forward. Copulation begins with the male standing on his hind legs behind the female, waving his forelegs in the air over her back at an acute angle to his own body. Copulation typically occurs three to five times within a 9-hour period. Kirk's dik-dik has a gestation period of 5 to 6 months, and can produce up to two offspring per year. Females reach sexual maturity between 6 and 8 months of age, while males reach sexual maturity between 8 and 9 months. Only one offspring is produced per gestation. Most births take place between November and December, and from April through May, which matches the timing of local rainy seasons. Unlike offspring of other ruminants, Kirk's dik-dik fawns are born with their fore legs held along the body, rather than extended forward. After birth, young offspring lie concealed away from their mother for 2 to 3 weeks, and the overall fawn survival rate is roughly 50%. Once they reach an appropriate age, young dik-diks begin to participate in the pair bonding marking ritual, and stay with their parents until a new offspring is born. When the new offspring arrives, the parents chase the older sibling out of their territory. The older offspring then goes to find its own territory and mate.
