Some primates, especially captive chimpanzees, throw feces in social or display contexts. Possible explanations include communication, frustration, or excitement, and feces may be used when other throwable objects are unavailable. There is no single proven motive for every incident, and chimpanzees are apes—not monkeys.
Reports of wild howler monkeys show that feces throwing is not limited to captivity, but the available research does not establish how common it is across species or settings. Context matters more than a one-size-fits-all explanation.
First, an important correction: chimpanzees are not monkeys
People sometimes use “monkey” casually for any nonhuman primate. Zoologically, chimpanzees are apes, as are gorillas, orangutans, and bonobos. Monkeys include groups such as macaques, capuchins, baboons, and howler monkeys.
The best-supported accounts of feces throwing in the reviewed sources focus on chimpanzees, particularly captive chimpanzees. Reports of wild howler monkeys exist, but the evidence does not show that this is a typical behavior across primates.
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What might a feces throw communicate?
There is no single translation for a feces throw. It may occur in a communicative or display context, or be associated with frustration or excitement. Those are possible explanations for particular situations, not a reliable diagnosis of an individual animal’s motive.
Chimpanzees also throw objects such as rocks and branches in social contexts. In an enclosure where those objects are unavailable, feces may be a readily available alternative. The University of California, Santa Barbara’s Department of Anthropology quotes researcher Ronnie Steinitz: “Think of it as another intelligent being trying to communicate with you.” That is a useful framing, not proof that every throw has the same message.
Possible contexts and explanations
| Context or factor | What the evidence supports | Important limit |
|---|---|---|
| Communication or display | Chimpanzees throw objects in communicative or display contexts; feces throwing may occur in such situations. | It does not establish a single message or motive for every throw. |
| Captive setting and available objects | Feces may be used as a readily available projectile when rocks, branches, or other objects are unavailable. | This is not a universal explanation, and wild reports also exist. |
| Frustration or excitement around visitors | Visitor activity may contribute to frustration or excitement in some captive situations. | It cannot reliably identify the cause of a particular incident. |
| Individual learning | A functional-analysis case study found that feces throwing and spitting by one captive adult chimpanzee were maintained by consequences and were reduced by a function-based intervention. | A single-animal case study does not establish a universal treatment or explain all primates. |
Why might chimpanzees use feces as a projectile?
Chimpanzees throw other objects, including rocks and branches, in communicative or display contexts. In some zoo enclosures, feces may be available when other throwable objects are not. This is a plausible explanation for the choice of projectile in those settings, not a proven account of every incident.
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It is also not evidence that an animal is deliberately trying to disgust or embarrass a person. Avoid attributing human-like motives without evidence.
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Does throwing feces mean a chimpanzee is angry, bored, or aggressive?
Not necessarily. The behavior may occur in different social contexts, and frustration or excitement may be relevant in some situations. The reviewed research does not establish boredom, anger, or aggression as a universal cause.
To interpret an incident responsibly, consider the species, whether the animal is wild or captive, what objects are available, the immediate social context, and whether the claim comes from a direct behavioral study or an expert-informed interpretation.
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What does the behavior study show?
A peer-reviewed functional-analysis case study examined feces throwing and spitting by one captive adult chimpanzee. The authors reported that a function-based treatment combining extinction with differential reinforcement of an alternative behavior reduced the target behavior.
This shows that an individual’s behavior can be assessed and modified in a particular case. It is not a broad survey of monkeys, proof of one motive across species, or a universal management prescription. Any intervention for a primate should be assessed and carried out by qualified professionals.
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Do monkeys throw poop in the wild?
Reports of wild howler monkeys show that feces throwing is not exclusive to captive animals. Chimpanzees also throw objects in social contexts, but evidence about feces throwing specifically is more limited. Do not generalize an observation from one species or setting to all wild primates.
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Frequently Asked Questions
Why do chimpanzees throw poop at people?
It may occur in a communicative or display context, or be associated with frustration or excitement. In some enclosures, feces may be readily available when other throwable objects are not. The behavior’s cause can differ between individuals and situations.
Do all monkeys throw poop?
No. The reviewed evidence does not establish that feces throwing is typical across monkeys or primates, and it provides no cross-species prevalence rate.
Do monkeys throw poop in the wild?
Reports of wild howler monkeys exist. They show that captivity is not an absolute requirement, but they do not establish how common the behavior is in wild populations.
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It may occur in communicative or display contexts, and frustration or excitement may be relevant in some cases. The reviewed sources do not establish boredom or aggression as a universal explanation.
Can training stop a chimpanzee from throwing feces?
A case study found that a function-based intervention reduced feces throwing and spitting by one captive chimpanzee. That result should not be generalized into a universal treatment; qualified professionals must assess the individual and context.
The Bottom Line
Feces throwing is not a universal monkey trait, and it has no single proven meaning. Evidence focuses chiefly on captive chimpanzees, while reports of wild howler monkeys show that captivity is not the only setting where it has been observed. Communication, available objects, social context, and individual learning may all matter, but explanations should remain specific to the evidence.
Sources: University of California, Santa Barbara, Department of Anthropology: “Why Chimps Throw Poop”; Live Science: “Why Do Chimpanzees Throw Poop?”; “Functional Analysis and Treatment of Human-Directed Undesirable Behavior Exhibited by a Captive Chimpanzee”.
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