Most people who love primates often talk about gorillas or chimpanzees, our close cousins. But not much is said about bonobos, another close relative of humans.
Bonobos are also called “pygmy” or “dwarf chimpanzees” and are scientifically known as Pan paniscus. They were once thought to be a type of chimpanzee (Pan troglodytes), but in the early 1930s, they were recognized as a separate species.
Physical Description
Bonobos have rounder, less protruding, and darker faces compared to the brownish faces of chimpanzees. They have pink lips, narrow chests, long legs, and a small tail tuft as adults.
Their bodies are slender. Adult female bonobos are a little smaller than males. Females weigh about 33 kilograms, while males weigh about 45 kilograms. An adult bonobo stands at about 111 centimeters tall.
Habitat & Distribution of Bonobos
Bonobos live in both primary and secondary lowland rainforests, including swamp forests. They are found on the southern side of the Congo River and the northern side of the Kasai River in the Democratic Republic of Congo.
Bonobos are native to this country. They are separated from chimpanzees, which live on the northern side of the Congo River. Their lifespan in the wild is not well known, but in captivity, they can live up to 40 years.
Bonobos are listed as “endangered” on the IUCN Red List of Threatened Species. There are an estimated 15,000 to 20,000 left.
Their numbers are going down because of human settlement in their forests, ongoing insecurity in the region, and poaching.
Interesting Bonobo Behavior
Bonobos live both in trees and on the ground, but they spend most of their time in trees. They come down only when moving to another tree.
On the ground, they move using their knuckles, but they can also walk upright for short distances.
They use simple tools. For example, they use leaves to make umbrellas and drag branches to scare off threats.
Social Structures
Bonobos have different social rules from other great apes. They do not show strong male dominance. Instead, females often have higher social status.
In smaller groups, males may still be more dominant, but in larger groups, females often co-lead with males.
The leader of the group is usually an older female, often supported by another high-ranking female.
Bonobos live in stable groups of 30 to 100 individuals. These groups occupy areas between 22 and 60 square kilometers.
Most group members are females and young ones. Older females often join with their grown sons to increase their influence in the group.
Diet & Feeding Habits
Bonobos are omnivores. About 57% of their food is fruit. They also eat leaves, honey, invertebrates like earthworms and caterpillars, and sometimes meat from small animals like bats, flying squirrels, anomalures, and young duikers.
They are also thought to eat small primates, though this is rare. Some reports from captivity suggest they might practice cannibalism, but this has not been confirmed in the wild.
Threats to the Bonobo Population
Like gorillas and chimpanzees, bonobos face many threats. These include habitat loss due to human activity, ongoing conflict in the region, and hunting for bushmeat.
Because of this, only about 15,000 to 20,000 bonobos remain, living in small, scattered groups in the wild.
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