The Mainlan Serow, Capricornis sumatraensis is an endangered species of mammal. The Mainland Serow can often be found living alone or in small groups. It is a grazing animal that consumes grass, shoots and leaves. The Serow is most active at dawn and at dusk. It is a territorial animal and typically moves along beaten paths that it creates through its territory. It marks off its territory by depositing droppings and by marking.