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Rhesus Macaque

Macaca mulatta

Regulatory Status

The State of Florida regulates captive held rhesus macaques as Class II wildlife. A license is required to possess this species for public exhibition, commercial sales, or personal use. Applicants must possess substantial experience and meet specific facility and caging requirements.

The rhesus macaque is a nonnative species in Florida and is not protected except by anti-cruelty law. Homeowners do not need a permit to remove macaques on their own property. However, homeowners should exercise caution when dealing with any primate species. They may become aggressive when fed, and feeding wildlife brings people into close proximity with wildlife. Primates also carry a host of diseases that can be spread to humans. It is prohibited to feed wild monkeys in Florida to help prevent injuries and the spread of diseases to people.

Description

Rhesus macaques (or rhesus monkeys) are brown or grey in coloration and have pink, hairless faces. They range in weight from 12-17 pounds with an average height of 1.5-1.7 feet. The average lifespan of macaques is about 30-36 years in the wild and 27-40 years in captivity. Females reach sexual maturity at about 4 years of age and produce an average of 1 offspring per year.

Diet

Rhesus macaques have an omnivorous diet that includes roots, seeds, fruit and bark. They also consume insects and have been observed eating bird eggs. Rhesus macaques live in troops which may contain as many as 10-80 individuals. They climb and swim proficiently, but spend much of their time on the ground. Rhesus macaque populations can grow rapidly in areas populated by humans, particularly where they can raid crops, pick through garbage, or receive handouts from local residents.

Native Range

Rhesus macaques have an extensive native range that includes Afghanistan, Nepal, Thailand, Pakistan, India, Southeast Asia and China.

Florida Distribution

In the 1930’s, the manager of a glass bottom boat operation reportedly released six rhesus macaques on an island in the Silver River to attract tourists to his boat tours. The released monkeys swam to the surrounding forests and increased their numbers rapidly. As the popularity of these monkeys grew among tourists, the owner of Silver Springs Park released an additional six monkeys around 1948 on the north shore of the river in another attempt to boost revenue. Since then, the population of rhesus macaques in the Silver Springs area and lands adjoining the Ocklawaha River has grown to upwards of 400 individuals at times. Some private trapping and removal efforts have helped keep the population from drastically increasing over the years. As of 2015, the population inside Silver Springs State Park was estimated at 190 macaques, with the population along the Ocklawaha River at an unknown size.

Rhesus macaques introduced to the Florida Keys in the 1970s destroyed red mangroves, leading to massive vegetation loss and shoreline erosion. These macaques were subsequently removed from the Keys in 1990 and 2000. Click this link to see where the species has been reported in Florida.

The core population of rhesus macaques is in central Florida around the Silver River. Individual rhesus macaque sightings have occurred throughout Florida, most likely a result of roaming monkeys originating from the Silver Springs population. These sightings occur as far southwest as Polk County, as far northwest as Wakulla County and as far northeast as Flagler County.

Potential Impacts

Rhesus macaques pose a variety of environmental and human health concerns. Introduced rhesus macaques have caused environmental and economic impacts in some areas of the U.S. In Morgan Island, South Carolina, tidal creeks around the island tested positive for elevated levels of E.coli and fecal coliform bacteria due to the monkeys.

Rhesus macaques in Florida have tested positive for herpes B, a virus shed intermittently through bites and scratches or contact with bodily fluids. Around 18 incidents of rhesus macaque bites and scratches have been reported in Florida; many more incidents have been reported in their native range. No confirmed cases of a human contracting herpes B from a macaque in the wild have been documented, but fifty incidents of human infection contracted from macaques in captivity have been reported.

Behavioral observations show macaques may become aggressive when fed by humans. To avoid any potential herpes B transmission, bites, or scratches, the FWC passed a rule in 2017 prohibiting the feeding of any wild monkeys in Florida.

Researchers and wildlife workers have observed the macaques in Silver Springs State Park consuming nearly 50 species of plants and artificially placed quail eggs, which could indicate the potential for egg consumption of native species.

Frequently Asked Questions

What should I do if I see a Rhesus macaque?

  • Never approach or offer food to wild monkeys. Never place food or garbage so that it will attract wild monkeys.
  • If you encounter wild monkeys, keep pets on a leash and supervise children closely.
  • Dispose of uneaten food and garbage in closed trash containers. To help prevent conflicts with monkeys and other wildlife, feed pets indoors or remove uneaten pet food left outdoors.
  • If you are bitten or scratched by a wild monkey, immediately wash the wound and seek medical attention according to the CDC guidelines at cdc.gov/herpesbvirus. Call the National B Virus Resource Center for emergency information at 404-413-6550.

Should I report Rhesus macaque sightings?

If you observe a wild monkey that is posing an imminent threat to human safety, call the FWC’s Wildlife Alert Hotline at 888-404-FWCC (888-404-3922).

The FWC would like the public to report observations of rhesus macaques that are seen outside of the core population. Reports can be submitted to the FWC by using the free IveGot1 app for smartphones, by calling the Exotic Species Hotline at 888-IveGot1 (888-483-4681) or by going online to IveGot1.org.

How is the FWC managing this species?

FWC Law Enforcement responds to any public safety issues that involve wild monkeys. At the December 2017 Commission meeting, FWC Commissioners approved a rule change specifically prohibiting the feeding of free roaming, non-human primates in order to promote greater public safety and decrease health concerns.