There’s an island in Puerto Rico inhabited exclusively by a few scientists and 861 monkeys.

It’s called Monkey Island and if you want to see it, then to bad; no tourists allowed. The monkey residents of the island are descendants of a colony transported there from Calcutta in 1938 to provide permanent breeding stock for medical researchers. The island provides scientists the opportunity to study free-range primates without having to locate them in deep within a remote jungle.
Some of the researchers study the monkeys’ social hierarchies and interactions as part of a new field of research called sociobiology. Others are experimental psychologists who study the animal’s thinking process, often by employing attention grabbing colored poster boards and bags of fruit.
As different as the processes of the two disciplines are, the results they garner enhance our understanding of the species closes to ours, and according to some scientists can be used as “a window into the evolutionary past of human beings.”
(Source)

Read more at http://www.omg-facts.com/Animals/There-s-an-island-in-Puerto-Rico-inhabit/53049?id=53049&fromTN&c_val=9#3SyXeOOKAoHrTF48.99