1) The proboscis monkey has a large fleshy nose that males use to attract mates by amplifying their calls. 2) The red-shanked douc langur has distinctive red legs and a vibrant orange and yellow face with a long white tail. 3) Mandrills are the largest monkeys with brightly colored blue and red faces and rumps that become even more vivid when excited. 4) The golden snub-nosed monkey can survive in very cold temperatures due to its unique nose and is found only in China.