Getting a pet monkey is legal in some U.S. states but banned or heavily restricted in others, and the process involves far more than finding a breeder. Between permits, enclosure requirements, veterinary needs, and the psychological welfare of the animal itself, primate ownership is one of the most complex and costly commitments a person can take on. Prices start around $1,500 for smaller species and can exceed $60,000, with ongoing costs that last decades.
Where Primate Ownership Is Legal
U.S. states fall into a patchwork of regulations. Some states ban private ownership of non-human primates outright, including California, New York, and Colorado. Others allow ownership with a license or permit, such as Alaska and Arizona. A handful of states have no specific statute governing primate possession at all. The majority fall somewhere in between, requiring permits, veterinary certificates, or import documentation.
Arizona, for example, classifies all non-human primates as restricted wildlife. You can possess one, but only with a special license and full compliance with state housing guidelines. States that require permits typically involve an application process, facility inspections, and proof that you can meet the animal’s care standards. These permits can take weeks or months to obtain, and some states deny them to first-time exotic animal owners.
Before contacting a breeder, check your state’s exotic animal laws through your state wildlife agency or department of agriculture. Also check local ordinances. Some cities and counties ban primates even in states that technically allow them. Federal legislation to restrict interstate trade in primates has been introduced multiple times in Congress, most recently as the Captive Primate Safety Act of 2025, so the legal landscape could tighten further.
Common Species and What They Cost
The species most frequently sold as pets in the U.S. are capuchin monkeys, marmosets, and squirrel monkeys. Each varies significantly in price, size, and temperament.
- Marmosets: $1,500 to $2,500. The smallest commonly kept species, weighing under a pound. They’re social and active but fragile, and they scent-mark constantly.
- Capuchins: $5,000 to $7,000. Medium-sized, highly intelligent, and strong for their size. Capuchins are the species most people picture when they think “pet monkey,” but their intelligence makes them especially prone to behavioral problems in captivity.
- Squirrel monkeys: $9,000 or more. Social and curious, they live an average of 21 years in captivity, with females sometimes reaching 27 years.
Purchase price is only the entry point. Annual costs for veterinary care, food, enrichment, and enclosure maintenance run into thousands of dollars. Finding a veterinarian who treats primates is a challenge in most areas, and exotic animal vet visits cost significantly more than standard pet care.
Where to Buy a Monkey
Monkeys are purchased from licensed USDA breeders. The Animal Welfare Act requires anyone breeding or selling regulated animals to hold a USDA license, either as a Class A dealer (breeder) or Class B dealer (reseller). Buying from an unlicensed seller is both illegal and risky, since you have no assurance the animal was bred or raised humanely.
Reputable breeders will ask you questions about your setup, experience, and state laws before agreeing to sell. They should provide veterinary records, proof of USDA licensing, and documentation of the animal’s origin. Be wary of anyone willing to ship a primate without verifying your legal right to own one. Wait times of several months are common, as breeders often have limited availability.
Enclosure and Housing Requirements
Federal standards set minimum enclosure sizes based on the animal’s weight. A monkey weighing between about 7 and 22 pounds needs at least 4.3 square feet of floor space per animal and an enclosure at least 30 inches tall. Larger primates, those over 55 pounds, require a minimum of 25 square feet of floor area and 7 feet of height. When multiple monkeys share an enclosure, you add together the space requirements for each individual animal.
These are legal minimums, not ideal living conditions. Most primate welfare experts recommend enclosures many times larger, ideally including both indoor and outdoor areas. The enclosure needs to allow for species-typical behaviors: climbing, swinging, foraging, and exploring. Federal regulations specifically require environmental enrichment such as perches, swings, mirrors, manipulable objects, varied food items, and foraging-based feeding methods. A bare cage with food and water is a violation of federal standards.
Your home itself will also need modification. Monkeys are curious, strong relative to their size, and capable of opening latches, turning knobs, and pulling apart anything not bolted down. Primate-proofing a room is closer to toddler-proofing than setting up a dog crate.
Diet and Daily Care
Primates need a varied diet that closely mimics what they’d eat in the wild. For most pet species, this means a combination of commercial primate biscuits, fresh fruits and vegetables, insects, and protein sources like cooked eggs. The specific balance depends on the species. Marmosets, for instance, need tree gum or gum arabic as a regular dietary component, something unique to their biology.
Vitamin D3 and calcium supplementation is critical for most captive primates, since they often don’t get enough natural sunlight to synthesize vitamin D on their own. Metabolic bone disease, caused by calcium and vitamin D deficiency, is one of the most common health problems in pet monkeys and can cause painful, irreversible skeletal damage.
Daily care goes well beyond feeding. Monkeys need hours of interaction, mental stimulation, and physical activity every day. They cannot be left alone for a standard workday the way a dog or cat can. Many owners find that the time commitment is closer to caring for a young child than caring for a traditional pet.
Serious Health Risks to Humans
Because primates are so genetically close to humans, diseases pass between the two species with unusual ease. Bacteria, viruses, fungi, and parasites can all jump the gap in either direction.
The most dangerous risk comes from Herpes B virus, which is endemic in macaque monkeys. Up to 90% of adult macaques carry it, usually without symptoms. In humans, B virus causes a rapidly progressing brain and spinal cord infection with a fatality rate of roughly 70%. While macaques are not commonly sold as pets, other primate species carry their own disease risks.
Primates can also transmit tuberculosis (and catch it from their owners), along with a range of gut infections caused by Shigella, Salmonella, Campylobacter, Giardia, and Cryptosporidium. Bite wounds are another concern. Primate mouths harbor around 224 identified bacterial strains, and bites can cause extensive tissue damage even from small species. Simian immunodeficiency virus, closely related to HIV, is present in some primate populations, and filoviruses like Marburg have been transmitted to humans from African green monkeys.
Psychological Harm to the Animal
This is the dimension of monkey ownership that most people don’t fully appreciate before buying. Primates are intensely social animals that, in the wild, live in complex groups with constant interaction. Keeping a monkey alone in a human household, even with dedicated human attention, deprives it of the social structure its brain is wired to need.
Research on chimpanzees rescued from pet and entertainment settings found that individuals who were socially isolated before rescue displayed abnormal behaviors roughly 10 times more frequently than those who had been housed with peers. These abnormal behaviors include rocking, self-clasping, self-harm, and social withdrawal, patterns that researchers compare to complex post-traumatic stress disorder in humans. Early social deprivation has been linked to heightened anxiety in chimpanzees, marmosets, and rhesus macaques alike.
The damage is lasting. Studies show that primates raised in impoverished conditions develop stereotypic behaviors and cognitive deficits that persist for years, even after they’re moved into enriched environments with other primates. The earlier and longer the isolation, the more severe and permanent the effects. A monkey purchased young from a breeder and raised in a home is, from a welfare perspective, undergoing exactly this kind of early social deprivation.
The Long-Term Commitment
Squirrel monkeys live over 20 years in captivity. Capuchins can live 40 to 45 years. Marmosets typically reach 12 to 16 years. These are not short-term pets, and the behavioral challenges tend to escalate rather than diminish over time.
Young monkeys are relatively manageable. But as they reach sexual maturity, usually between 3 and 5 years depending on species, they often become aggressive, territorial, and unpredictable. This is normal primate behavior, not a training failure. Many owners find themselves unable to handle their monkey by this stage, and rehoming options are extremely limited. Sanctuaries are often full, and most zoos will not accept former pets. Some owners resort to keeping the animal permanently caged, which worsens the psychological problems described above.
If you’re seriously considering primate ownership, volunteering at a primate sanctuary first gives you a realistic picture of what daily care looks like over the full lifespan of the animal, not just the appealing infant stage that breeders tend to showcase.