Silver Spring State Park is a vast area of forests, wetlands, and a spring-fed river in the middle of central Florida. The park was once renowned for its scenic views and native wildlife, making it one of the first tourist attractions in Florida. However, the park’s monkeys have been its main draw for the past 80 years.

Believe it or not — Silver Spring State Park is home to something like 300 rhesus macaques, a monkey local to south and southeast Asia. A new study projects that the monkey population will double by 2022 unless state agencies take action to control it because of the animals’ rapid breeding.

The study, which was published on October 26 in the journal Wildlife Management, asserts that such an increase could seriously jeopardize the health of the park and its visitors. This is due, among other issues, to the fact that the monkeys carry a rare and fatal form of the herpes virus known as herpes B. Although it is extremely, extremely rare for herpes B to spread from a monkey to a human, it can be fatal.