Ordinary proboscis monkeys live on the island of Kalimantan (Borneo). Females and young males small upturned noses, but after 7 years of the nose in male begins to grow, gradually turning into a kind of hanging in the mouth of a pear with a length of 8-10 cm, which during meals have to be taken in order not interfered with.
The nose serves as a "musical instrument" in the morning "concerts" monkeys. It helps to release deep, loud sounds, resembling the sound of the organ and can be heard in the district for several kilometers. The cries of the monkeys look like the word "cahow", so they got its second name.
Males have a noticeably nose more. Probably because he "needed"because of his loud voice male in the district informs all that on this site he is the master.