In this Oct. 10, 2012 photo, a golden lion tamarin sits on a branch in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The charismatic little monkey is bouncing back from near extinction just in time to run for mascot of Rio's 2016 Olympics. The recovery effort that raised their population to 1,700 has become an international example of effective conservation, top experts say. (AP Photo/Felipe Dana)
In this Oct. 10, 2012 photo, a golden lion tamarin eats a banana in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The charismatic little monkey is bouncing back from near extinction just in time to run for mascot of Rio's 2016 Olympics. The recovery effort that raised their population to 1,700 has become an international example of effective conservation, top experts say. (AP Photo/Felipe Dana)
In this July 7, 2012 photo released by the Golden Lion Tamarin Association (AMLD), shows a tree nursery of native species saplings in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The state promise to plant 24 million trees would help further restore the swath of species-rich Atlantic forest that once covered much of Brazil's coast and ensure that the golden lion tamarin population, once near extinction, has enough room to thrive. (AP Photo/AMLD, Luis Paulo Ferraz)
In this Oct. 10, 2012 photo, native saplings are cultivated in a tree nursery to be used in a reforestation project in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The state promise to plant 24 million trees would help further restore the swath of species-rich Atlantic forest that once covered much of Brazil's coast and ensure that the golden lion tamarin population, once near extinction, has enough room to thrive. (AP Photo/Felipe Dana)
In this Oct. 10, 2012 photo, Patrick da Silva, left, and Talles de Almeida work on a reforestation project in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The state promise to plant 24 million trees would help further restore the swath of species-rich Atlantic forest that once covered much of Brazil's coast and ensure that the golden lion tamarin population, once near extinction, has enough room to thrive. (AP Photo/Felipe Dana)
In this Oct. 10, 2012 photo, a golden lion tamarin sits on a branch in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The charismatic little monkey is bouncing back from near extinction just in time to run for mascot of Rio's 2016 Olympics. The recovery effort that raised their population to 1,700 has become an international example of effective conservation, top experts say. (AP Photo/Felipe Dana)
In this Oct. 10, 2012 photo, a golden lion tamarin lounges on a branch during a grooming session in the Atlantic Forest region of Silva Jardim, in Brazil's state of Rio de Janeiro. The charismatic little monkeys are bouncing back from near extinction just in time to run for mascot of Rio's 2016 Olympics. The recovery effort that raised their population to 1,700 has become an international example of effective conservation, top experts say. (AP Photo/Felipe Dana)
In this Oct. 10, 2012 photo, a golden lion tamarin hugs a tree in the Atlantic Forest region of Silva Jardim in Brazil's state of Rio de Janeiro. The charismatic little monkey is bouncing back from near extinction just in time to run for mascot of Rio's 2016 Olympics. The recovery effort that raised their population to 1,700 has become an international example of effective conservation, top experts say. (AP Photo/Felipe Dana)