The Sumatran serow is generally a solitary animal, although it may sometimes move about in groups of several individuals (2). Each serow inhabits a small area which is well marked with trails, dung heaps, and scents (4). This small area of habitat is selected so it can provide all the needs of the serow, such as sufficient grass, shoots and leaves on which to feed on during the early morning and late evening, and suitable sheltered resting places in caves or under overhanging rocks and cliffs (2). This home range is defended against any intruding serows by using their dagger-like horns, which are also used by this rather aggressive goat-antelope to fight off predators (4).
Although less specialised for climbing rugged mountains than some of its relatives (4), and with a somewhat slow and clumsy gait, the serow is nevertheless adept at descending steep, rocky slopes (2), and is also even known to swim between small islands in Malaysia (2).
Serows are thought to mate primarily between October and November. The gestation period lasts for about seven months, with a single young usually born in the spring. Female serows usually reach sexual maturity at around 30 months, while males become sexually mature between 30 and 36 months of age (2).