In the heart of central Florida lies Silver Spring State Park—a large patchwork of forests and wetlands with a spring-fed river flowing through it. One of Florida’s first tourist attractions, the park was once known for its scenic vistas and native wildlife. But for the last 80 years, the park’s biggest draw has been its monkeys.

That’s right—Silver Spring State Park is home to at least 300 rhesus macaques, a monkey native to south and southeast Asia. The animals are breeding rapidly, and a new study estimates that the monkey population will double by 2022 unless state agencies take steps to control it.

The study, published October 26 in the journal Wildlife Management, claims that such an increase could