In Madagascar there are 21 species of lemur and its relatives, with most of them spending much of time in the trees. The Sifaka (Propithecus verreauxi), a little larger than the Ring-tail, has become a specialist jumper. Its legs are considerably longer than its arms and enables it to leap four or five metres from one tree to another. However, when these animals come to the ground they cannot use all four feet but have to hop using two feet. Sifakas have scent glands beneath their chins; they mark their territory by rubbing them on an upright branch and then reinforce the effect by dribbling urine over the bark, wriggling their hips and slowly drawing themselves up the branch as they do so.