For the first time since 1921, scientists observed a living pygmy tarsier -- one of the planet's smallest and rarest primates -- on the Indonesian island of Sulawesi. Some scientists believed the tarsiers had become extinct because they had not been seen for so long. The nocturnal animals are very small -- weighing 2 ounces -- and have large eyes and ears. (Sharon Gursky-Doyen/Texas A&M University/Courtesy of National Geographic Society )
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