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Imagine walking through Rock Creek Park in Washington D.C. in the early 1990s. You might have seen something very strange: a troop of small monkeys with bright orange fur walking right in the open. These monkeys had long, thin fingers that looked like twigs. They were not regular wild animals; they were endangered golden lion tamarins.
The Smithsonian National Zoo had released these monkeys on a special section of their land that connected directly to the public park. They were testing whether the monkeys could survive outside. Carlos Ruiz-Miranda, a scientist at a university in Brazil, remembers this time well. He started working on the project in 1992. He recalls that the tamarins could go anywhere in the city or even further; they could have walked all the way to Baltimore if they wanted to. But they were not staying in America. They were part of a special training program designed to get them ready to return to their home in Brazil.
This project was an attempt to save the species from dying out completely. To monitor them, the monkeys wore small radio collars, which allowed zoo staff to track their movements daily. The main goal was to ensure the tamarins could live independently in the wild, surviving without any human assistance.
Golden lion tamarins are native only to the Atlantic Forest of Brazil. For many years, this forest has been cleared for development and agriculture. The problem began long ago; when Portuguese colonizers arrived in 1500, they started destroying the forest. This environmental shift made it difficult for the tamarins to survive.
Brazilian biologist Adelmar Coimbra-Filho recognized the danger first. In the 1960s, he traveled through the remaining forests but could barely find any tamarins. He knew immediate action was necessary. In 1962, he attempted to breed them in captivity, hoping that zoo breeding programs would help boost their numbers.