Touristic expansion into the mangrove forest includes stopping to sightsee the capuchin monkeys and their unique tool use behavior. The bearded capuchin species is the only tool user, crab-eating, living solely in the mangrove forests of Maranhao. The exploitation of shellfish by capuchins likely explains how in mangroves they can survive on small, isolated mangrove islands, while the same species require home-ranges 10 times larger to survive in other areas. This site-specific finding alone is likely of broad scientific interest. This project is investigating the landscape changes in the mangrove of Rio Preguicas, the behavior of the capuchins living within the mangroves,  and food resources availability for this population. Our goal is to understand and promote human-primate coexistence.