A female Rhesus Macaque monkey carries a young monkey by the Silver River in Silver Springs State Park in Florida in 2013. In a study released Monday in The Journal of Wildlife Management, researchers found that the number of rhesus macaques at Silver Springs State Park will grow to 350 animals or more by 2022. When the study was conducted in 2015, there were about 175 monkeys in the park. [FILE/THE ASSOCIATED PRESS]