Bornean yellow muntjacs occur only on the island of Borneo and are primarily diurnal. Previously classified as a subspecies of the Indian muntjac (Muntiacus muntjak), they finally received formal species status in 1982. Bornean yellow muntjacs make a noise that sounds like a barking dog, a common characteristic among muntjac species. These small animals reach a height just over 1.7 feet (50 cm) at the shoulder and are found mainly in moist forests. Their diet includes herbs, grasses, fruits and seeds.