The proboscis monkey has a large protruding belly that is thought to stick out so much due to the proboscis monkeys diet and complex digestion system, which along with the long nose of the males, gives the proboscis monkey very distinctive yet strange characteristics.
The proboscis monkey is a proficient swimmer and appears to spend a large amount of time in the water. Proboscis monkeys are most commonly found inhabiting mangrove swamps and will wade through shallow water and can swim when the water gets too deep.
Proboscis monkey troops consist of the alpha adult male and a number of females, as well as their offspring. It is not uncommon however for both the male and female proboscis monkeys to move between social groups.
The diet of the proboscis monkey consists mainly of leaves, shoots, seeds and unripe fruit. It is known that proboscis monkeys are not too fond of fleshy fruits and the complex nature of the digestive system of the proboscis monkey means that they are unable to digest ripe fruit.
Female proboscis monkeys give birth to one baby proboscis monkey after a gestation period of nearly 6 months. The baby proboscis monkeys are thought to be born with much darker fur, and small noses which grow in size as the baby proboscis monkey gets older. The reddish fur of the adult proboscis monkey is lthought to appear with age.