This book is about tamarins, which are monkeys that are native to Brazil in South America. They need the rain forests to survive, but people cut down trees for wood and cleared the land for farming. Tamarins weigh less than two pounds and are less than a foot long. There are many varieties of tamarins, including the golden lion tamarin. Tamarins are being raised at the National Zoo in Washington, DC, to be released into the rain forest in Brazil. The goal is to reach 2,000 tamarins in the wild by 2025.