Scientists Observe Chimps Treating Their Wounds With Bugs In Historic First

Published February 8, 2022

"Chimpanzees eat insects, but we did not know that they catch and use them to treat their wounds."

Three Chimpanzees In Forest Trees

Ozouga Chimpanzee ProjectThe study involved monitoring a group of 45 chimpanzees over the course of 15 months.

From bears and deer to pregnant elephants, the world is flush with animals that can treat themselves for various medical issues. While chimpanzees have long been noted to eat leaves that protect their guts from parasites, they’ve now been observed treating their wounds with insects — for the very first time.

According to CNN, this unprecedented discovery was made at Loango National Park in Gabon in 2019. The study was conducted by the Ozouga Chimpanzee Project and German researchers from the University of Osnabrück (UO) and involved a community of 45 chimps that were monitored over the course of 15 months.

As published in the Current Biology journal, the project initially aimed to explore the relationships between chimps and how they hunted. This rapidly changed when experts spotted individual specimens applying ground-up insects onto their own wounds and those of others in a remarkable act of medical treatment.

“Chimpanzees eat insects but we did not know that they catch and use them to treat their wounds,” said study author Simone Pika. “Hence, they not only have an understanding of their food species but probably also about characteristics of other animal species that help to act against injuries.”

Two Chimpanzees Using Insects

Ozouga Chimpanzee ProjectResearchers spotted 19 instances of self-application and three instances of chimpanzees helping each other.

Fortunately for the world at large, the researchers captured remarkable footage of this behavior which only complemented their detailed study. According to The Washington Post, they recorded 19 instances of chimps applying insects to their own wounds and three instances of them rubbing the bugs onto others.

Alessandra Mascaro, a volunteer with the Ozouga Chimpanzee Project, vividly recalls the first time it happened. According to IFL Science, a female chimp named Suzee realized that her son Sia had suffered a wound on his foot. She then grabbed something out of thin air and placed it between her lips.

“I noticed that she appeared to have something between her lips that she then applied to the wound on Sia’s foot,” said Mascaro. “Later that evening, I re-watched my videos and saw that Suzee had first reached out to catch something which she put between her lips and then directly onto the open wound on Sia’s foot.”

“In the video, you can see that Suzee is first looking at the foot of her son, and then it’s as if she is thinking, ‘What could I do?’ and then she looks up, sees the insect, and catches it for her son.”

Two Chimpanzees In Jungle

Ozouga Chimpanzee ProjectOne instance saw an adult female apply an insect to the foot wound of her son.

The next week, doctoral student Lara Southern spotted an adult male named Freddy doing the exact same thing. Soon after, an adult female named Carol was observed snatching an insect before applying it to the shin laceration on an adult male named Littlegrey — suggesting this repeated behavior was no anomaly.

The team observed a clear pattern that involved the chimps first catching an insect, immobilizing it by putting it between their lips, and then placing it onto a wound and rubbing it around. While the particular species of insect they used has yet to be identified, the researchers believe it likely has “soothing properties” for pain relief.

“Our observations provide the first evidence that chimpanzees regularly capture insects and apply them onto open wounds,” said Tobias Deschner, a primatologist with the project. “We now aim to investigate the potential beneficial consequences of such a surprising behavior.”

“Studying great apes in their natural environments is crucial to shed light on our own cognitive evolution. We need to still put much more effort into studying and protecting them and also protecting their natural habitats.”

Ozouga Chimpanzee Project Footage

Alessandra Mascaro/Ozouga Chimpanzee ProjectA chimpanzee using her lips to apply the insects.

It’s important to note that non-nutritional plants have long been consumed by various animals for a variety of reasons. Pregnant elephants in Kenya, for instance, eat certain leaves to induce delivery. Bears and deer have long been known to eat medicinal plants, as well, and chimpanzees themselves are aware of their use.

“Our two closest living relatives, chimpanzees and bonobos, for instance, swallow leaves of plants with anthelmintic properties and chew bitter leaves that have chemical properties to kill intestinal parasites,” explained Pika.

This latest study is potential evidence of pro-social behavior in chimps. According to the study, this remarkable discovery poses “a problem for evolutionary theory, because it was not immediately clear why organisms might help others in the face of selection operating in the interest of self.”

After reading about chimps medicating themselves with bugs, learn about the survey concluding that there are more gorillas and chimps than we thought. Then, read about Ham the chimp, the animal astronaut who changed history.

Marco Margaritoff
A former staff writer for All That’s Interesting, Marco Margaritoff holds dual Bachelor's degrees from Pace University and a Master's in journalism from New York University. He has published work at People, VICE, Complex, and serves as a staff reporter at HuffPost.
Cara Johnson
A writer and editor based in Charleston, South Carolina and an assistant editor at All That's Interesting, Cara Johnson holds a B.A. in English and Creative Writing from Washington & Lee University and an M.A. in English from College of Charleston and has written for various publications in her six-year career.