The Disney Parks Blog has reported that the new Cotton-Top Tamarin exhibit has opened up as part of the Discovery Island Trails. The new exhibit has appeared complete for over a month, but the animals were reportedly not moved until today. The new location is across from Creature Comforts in Discovery Island.
The tamarins were originally in Rafiki's Planet Watch. They moved to the Tree of Life Exhibits towards the front of the park in March of 2011 and now take up residence in their new habitat.
The below video discusses the conservation efforts for the Cotton-Top Tamarins: