Ramon Espinosa
Share this story
In this Wednesday, Oct. 4, 2017 photo, a monkey eats atop a rock off of Cayo Santiago, known as Monkey Island, in Puerto Rico, one of the world’s most important sites for research into how primates think, socialize and evolve.

Start Free AccountGet access to 7 premium stories every month for FREE!
Already a Subscriber?Current print subscriber? Activate your complimentary Digital account.
Subscribe NowChoose a package that suits your preferences.