The mandrill is the heaviest living monkey, somewhat surpassing even the largest baboons such as chacma baboon and olive baboons in average weight even considering its more extreme sexual dimorphism, but the mandrill averages both shorter in the length and height at the shoulder than these species.

Mandrill................. The world's largest monkey is the mandrill. It weights around 77 pounds (35 kilograms) and is around 3 feet (1 meter) tall.

The largest monkey in the world is the Male Mandrill (Mandrillus sphinx), which belongs to the Old World monkey family. Here is an in-depth explanation of the Male Mandrill as the largest monkey:

Physical Appearance:
The Male Mandrill is known for its striking and colorful appearance. It has a long, muscular body covered in olive-green or gray fur. The most distinguishing feature is its face, which exhibits a vibrant combination of blue, red, and yellow colors. Additionally, they possess long canine teeth, which can grow up to 2.5 inches in length.

Size and Weight:
The Male Mandrill is considerably larger than other monkey species. On average, they measure around 30-37 inches in length, excluding the tail, which is approximately 2 feet long. They stand at a height of about 2.5 feet at the shoulder. Regarding weight, a Male Mandrill can range from 50 to 82 pounds.

Sexual Dimorphism:
One of the key characteristics of the Male Mandrill is the pronounced sexual dimorphism between males and females. Males are significantly larger and more robust than their female counterparts. They also possess a distinctive, brightly colored face, while female mandrills have a less vibrant appearance.

Social Behavior:
Male Mandrills live in multi-male, multi-female social groups called troops. These troops can consist of up to 800 individuals, including several adult males. The largest and most dominant male, known as the alpha male, leads the troop. The other males usually have lower social status and are subordinate to the alpha male.

Diet and Habitat:
Mandrills are omnivorous, feeding on a variety of foods. They primarily consume fruits, seeds, leaves, insects, and even small vertebrates. They inhabit the rainforests and dense jungles of equatorial Africa, specifically in countries like Gabon, Cameroon, and Congo.

Threats and Conservation:
Unfortunately, the population of Mandrills is declining due to habitat loss, deforestation, and hunting for bushmeat. The International Union for Conservation of Nature (IUCN) classifies them as vulnerable. Efforts are being made to protect their natural habitats and prevent further population decline.

In conclusion, the Male Mandrill is the largest monkey in the world. Its distinctive appearance, size, and social behavior make it a fascinating primate species. However, their conservation status highlights the need for concerted efforts to protect their populations and habitats.