This book is a collection of photographs of rhesus monkeys living on the island of Cayo Santiago in Puerto Rico since 1938. The photos span my 40 years of work with the Cayo Santiago monkeys. The book is dedicated to the monkeys, to the staff of the Caribbean Primate Research Center who care for them, and the people of Puerto Rico who have so kindly looked after the many investigators who have worked there over the years. I hope you enjoy the photos of these wonderful animals.



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