Why do I howl? It is important to keep in contact with my troop as we travel through the rainforest. We also have to keep other groups of monkeys away from us. I have a prove that I am the leader of the group by the strength of my howl and by my daring. I travel on open bridges and along slender branches where it is very hard to keep my balance, too scary for others in my troop to travel. - Mantled Howler Monkey Leader It is important that...